LOAndroid3: ant/make for building, Bootstrap project

LOAndroid3 is based of LibreOffice4Android project which uses
ant/make for building. By using LibreOffice4Android as the base,
the project creates a APK archive which has all needed files
to start LibreOffice in Android environment.

Change-Id: I697d5f727bdaf93e774144ad597d7081d2609908

90 files changed, 9533 insertions, 0 deletions

diff --git a/android/CustomTarget_lo_android.mk b/android/CustomTarget_lo_android.mk
new file mode 100644
index 000000000000..4d32cac168dd
--- /dev/null
+++ b/android/CustomTarget_lo_android.mk
@@ -0,0 +1,36 @@
+# -*- Mode: makefile-gmake; tab-width: 4; indent-tabs-mode: t -*-
+#
+# This file is part of the LibreOffice project.
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+$(eval $(call gb_CustomTarget_CustomTarget,android/loandroid3))
+
+loandroid3_DIR := $(call gb_CustomTarget_get_workdir,android/experimental/LOAndroid3)
+
+$(call gb_CustomTarget_get_target,android/loandroid3) : \
+	$(loandroid3_DIR)/done
+
+# We want that to be built completely first,
+# so that we can serialize Ant access to Bootstrap, which is used both
+# by DocumentLoader. We don't want one Ant to be cleaning
+# out Bootstrap while another is building stuff that depends on it.
+# Yeah, this sucks
+
+$(loandroid3_DIR)/done : $(call gb_Postprocess_get_target,AllModulesButInstsetNative)
+	$(call gb_Output_announce,$(subst $(WORKDIR)/,,$@),$(true),MAK,2)
+	cd $(SRCDIR)/android/experimental/LOAndroid3 && $(MAKE) all
+# Copy to $(BUILDDIR)/instsetoo_native as that is where the tinderbox build script
+# still looks for the .apk, and we want fresh daily builds to be uploaded. Even if
+# the apps as such are mostly useless.
+# Us "foo" instead of the old INPATH
+	mkdir -p $(BUILDDIR)/instsetoo_native/foo/bin; \
+	cp $(SRCDIR)/android/experimental/LOAndroid3/bin/*-debug.apk $(BUILDDIR)/instsetoo_native/foo/bin
+
+$(call gb_CustomTarget_get_clean_target,android/loandroid3) :
+	$(call gb_Output_announce,$(subst $(WORKDIR)/Clean/,,$@),$(false),MAK,2)
+	cd $(SRCDIR)/android/experimental/LOAndroid3 && $(MAKE) clean
+
+# vim: set noet sw=4 ts=4:
diff --git a/android/Module_android.mk b/android/Module_android.mk
index e8604491d6f0..eedc57aa15ba 100644
--- a/android/Module_android.mk
+++ b/android/Module_android.mk
@@ -13,6 +13,7 @@ ifeq ($(OS),ANDROID)
 
 $(eval $(call gb_Module_add_targets,android,\
 	CustomTarget_lo4android \
+	CustomTarget_lo_android \
 	CustomTarget_android_desktop \
 ))
 
diff --git a/android/experimental/LOAndroid3/AndroidManifest.xml b/android/experimental/LOAndroid3/AndroidManifest.xml
new file mode 100644
index 000000000000..81e88226f0c5
--- /dev/null
+++ b/android/experimental/LOAndroid3/AndroidManifest.xml
@@ -0,0 +1,29 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="org.libreoffice"
+    android:installLocation="preferExternal"
+    android:versionCode="1"
+    android:versionName="1.0">
+
+    <!-- App requires OpenGL ES 2.0 -->
+    <uses-sdk android:minSdkVersion="4" android:targetSdkVersion="11"/>
+
+    <uses-feature android:glEsVersion="0x00020000" android:required="true" />
+    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
+
+    <application
+        android:allowBackup="true"
+        android:icon="@drawable/main"
+        android:label="@string/app_name"
+        android:hardwareAccelerated="true"
+        android:theme="@style/AppTheme" >
+        <activity
+            android:name="LibreOfficeMainActivity"
+            android:label="@string/app_name" >
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+</manifest>
diff --git a/android/experimental/LOAndroid3/Makefile b/android/experimental/LOAndroid3/Makefile
new file mode 100644
index 000000000000..4db011f13616
--- /dev/null
+++ b/android/experimental/LOAndroid3/Makefile
@@ -0,0 +1,128 @@
+ifeq ($(BUILDDIR),)
+include ../../../config_host.mk
+endif
+
+# The default target just builds.
+
+all: build-ant
+
+# The package of this app
+APP_PACKAGE=org.libreoffice
+
+BOOTSTRAPDIR=../../Bootstrap
+include $(BOOTSTRAPDIR)/Makefile.shared
+
+native-code.cxx: $(SRCDIR)/solenv/bin/native-code.py
+	$< -g core -g writer > $@
+
+copy-stuff:
+# Then "assets". Let the directory structure under assets mimic
+# that under solver for now.
+#
+# Please note that I have no idea what all of this is really necessary and for
+# much of this stuff being copied, no idea whether it makes any sense at all.
+# Much of this is copy-pasted from android/qa/sc/Makefile (where a couple of
+# unit tests for sc are built, and those do seem to mostly work) and
+# android/qa/desktop/Makefile (mmeeks's desktop demo, also works to some
+# extent).
+#
+	mkdir -p assets/gz.unpack/program/ure assets/lib assets/program/services assets/ure/share/misc assets/ComponentTarget/i18npool/util
+	gzip -9 <$(INSTDIR)/$(LIBO_ETC_FOLDER)/types/offapi.rdb >assets/gz.unpack/program/offapi.rdb
+	gzip -9 <$(INSTDIR)/$(LIBO_ETC_FOLDER)/types/oovbaapi.rdb >assets/gz.unpack/program/oovbaapi.rdb
+	gzip -9 <$(INSTDIR)/$(LIBO_URE_SHARE_FOLDER)/misc/types.rdb >assets/gz.unpack/program/udkapi.rdb
+# For some reason the vnd.sun.star.expand:$LO_LIB_DIR doesn't seem to work, it expands to empty!?
+	for F in program/services/services ure/share/misc/services; do \
+		sed -e 's!uri="vnd.sun.star.expand:$$LO_LIB_DIR/!uri="file://$$APP_DATA_DIR/lib/!g' <$(INSTDIR)/$$F.rdb >assets/$$F.rdb; \
+	done
+	cp $(SRC_ROOT)/odk/examples/java/DocumentHandling/test/test1.odt \
+		assets
+	cp $(WORKDIR)/ComponentTarget/i18npool/util/i18npool.component assets/ComponentTarget/i18npool/util
+#
+	mkdir -p assets/share/config
+	cp -R $(INSTDIR)/share/registry assets/share
+	cp -R $(INSTDIR)/share/config/soffice.cfg assets/share/config
+#
+# Set up rc, the "inifile". See BootstrapMap::getBaseIni(). As this app
+# doesn't use soffice_main() (at least I think it shouldn't), the
+# rtl::Bootstrap::setIniFilename() call there that hardcodes
+# /assets/program/lofficerc isn't executed. Instead the hardcoding of
+# /assets/rc in BootstrapMap::getBaseIni() gets used.
+	echo '[Bootstrap]' > assets/rc
+	echo 'Logo=1' >> assets/rc
+	echo 'NativeProgress=1' >> assets/rc
+	echo 'URE_BOOTSTRAP=file:///assets/program/fundamentalrc' >> assets/rc
+#	echo 'RTL_LOGFILE=file:///dev/log/main' >> assets/rc
+	echo 'HOME=$$APP_DATA_DIR/cache' >> assets/rc
+	echo 'OSL_SOCKET_PATH=$$APP_DATA_DIR/cache' >> assets/rc
+#
+# Set up fundamentalrc
+	echo '[Bootstrap]' > assets/program/fundamentalrc
+	echo 'LO_LIB_DIR=file://$$APP_DATA_DIR/lib/' >> assets/program/fundamentalrc
+	echo 'URE_LIB_DIR=file://$$APP_DATA_DIR/lib/' >> assets/program/fundamentalrc # checkme - is this used to find configs ?
+	echo 'BRAND_BASE_DIR=file:///assets' >> assets/program/fundamentalrc
+	echo 'CONFIGURATION_LAYERS=xcsxcu:$${BRAND_BASE_DIR}/share/registry res:$${BRAND_BASE_DIR}/share/registry' >> assets/program/fundamentalrc
+	echo 'URE_BIN_DIR=file:///assets/ure/bin/dir/nothing-here/we-can/exec-anyway' >> assets/program/fundamentalrc
+#
+# Set up unorc
+	echo '[Bootstrap]' > assets/program/unorc
+	echo 'URE_INTERNAL_LIB_DIR=file://$$APP_DATA_DIR/lib/' >> assets/program/unorc
+	echo 'UNO_TYPES=file://$$APP_DATA_DIR/program/udkapi.rdb file://$$APP_DATA_DIR/program/offapi.rdb file://$$APP_DATA_DIR/program/oovbaapi.rdb' >> assets/program/unorc
+	echo 'UNO_SERVICES=file:///assets/ure/share/misc/services.rdb file:///assets/program/services/services.rdb' >> assets/program/unorc
+#
+# Set up bootstraprc
+	echo '[Bootstrap]' > assets/program/bootstraprc
+	echo 'InstallMode=<installmode>' >> assets/program/bootstraprc
+	echo 'ProductKey=LibreOffice $(LIBO_VERSION_MAJOR).$(LIBO_VERSION_MINOR)' >> assets/program/bootstraprc
+	echo 'UserInstallation=file://$$APP_DATA_DIR' >> assets/program/bootstraprc
+#
+# Set up versionrc
+	echo '[Version]' > assets/program/versionrc
+	echo 'AllLanguages=en-US' >> assets/program/versionrc
+	echo 'BuildVersion=' >> assets/program/versionrc
+	echo 'buildid=dead-beef' >> assets/program/versionrc
+	echo 'ProductMajor=360' >> assets/program/versionrc
+	echo 'ProductMinor=1' >> assets/program/versionrc
+	echo 'ReferenceOOoMajorMinor=3.6' >> assets/program/versionrc
+#
+# .res files
+	mkdir -p assets/program/resource
+	cp $(INSTDIR)/$(LIBO_SHARE_RESOURCE_FOLDER)/*en-US.res assets/program/resource
+#
+# Assets that are unpacked at run-time into the app's data directory. These
+# are files read by non-LO code, fontconfig and freetype for now, that doesn't
+# understand "/assets" paths.
+	mkdir -p assets/unpack/etc/fonts
+	cp fonts.conf assets/unpack/etc/fonts
+# $UserInstallation/user/fonts is added to the fontconfig path in
+# vcl/generic/fontmanager/helper.cxx: psp::getFontPath(). UserInstallation is
+# set to the app's data dir above.
+	mkdir -p assets/gz.unpack/user/fonts
+	for F in $(INSTDIR)/share/fonts/truetype/Liberation*.ttf $(INSTDIR)/share/fonts/truetype/Gen*.ttf $(INSTDIR)/share/fonts/truetype/opens___.ttf; do \
+		gzip -9 <$$F >assets/gz.unpack/user/fonts/`basename $$F`; \
+	done
+#
+# Then gdbserver and gdb.setup so that we can debug with ndk-gdb.
+#
+	mkdir -p $(SODEST)
+	cp $(ANDROID_NDK_GDBSERVER) $(SODEST)
+	echo set solib-search-path ./obj/local/$(ANDROID_APP_ABI) >$(SODEST)/gdb.setup
+
+build-ant: android_version_setup copy-stuff link-so properties
+#
+# Copy jar files we need
+#
+	for F in java_uno \
+		 juh \
+		 jurt \
+		 ridl \
+		 unoloader; do \
+	    $(call COPYJAR,$(INSTDIR)/$(LIBO_URE_SHARE_JAVA_FOLDER)/$${F}.jar); \
+	done
+	for F in unoil; do \
+	    $(call COPYJAR,$(INSTDIR)/$(LIBO_SHARE_JAVA_FOLDER)/$${F}.jar); \
+	done
+#
+	unset JAVA_HOME && $(ANT) -quiet debug
+
+run:
+	adb shell am start -n $(APP_PACKAGE)/.ui.LibreOfficeUIActivity -e input /assets/test1.odt
diff --git a/android/experimental/LOAndroid3/build.xml b/android/experimental/LOAndroid3/build.xml
new file mode 100644
index 000000000000..52d06eede74c
--- /dev/null
+++ b/android/experimental/LOAndroid3/build.xml
@@ -0,0 +1,84 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project name="LibreOfficeViewer" default="help">
+
+    <!-- The local.properties file is created and updated by the 'android' tool.
+         It contains the path to the SDK. It should *NOT* be checked into
+         Version Control Systems. -->
+    <loadproperties srcFile="local.properties" />
+
+    <!-- The ant.properties file can be created by you. It is only edited by the
+         'android' tool to add properties to it.
+         This is the place to change some Ant specific build properties.
+         Here are some properties you may want to change/update:
+
+         source.dir
+             The name of the source directory. Default is 'src'.
+         out.dir
+             The name of the output directory. Default is 'bin'.
+
+         For other overridable properties, look at the beginning of the rules
+         files in the SDK, at tools/ant/build.xml
+
+         Properties related to the SDK location or the project target should
+         be updated using the 'android' tool with the 'update' action.
+
+         This file is an integral part of the build system for your
+         application and should be checked into Version Control Systems.
+
+         -->
+    <property file="ant.properties" />
+
+    <!-- The project.properties file is created and updated by the 'android'
+         tool, as well as ADT.
+
+         This contains project specific properties such as project target, and library
+         dependencies. Lower level build properties are stored in ant.properties
+         (or in .classpath for Eclipse projects).
+
+         This file is an integral part of the build system for your
+         application and should be checked into Version Control Systems. -->
+    <loadproperties srcFile="project.properties" />
+
+    <!-- quick check on sdk.dir -->
+    <fail
+            message="sdk.dir is missing. Make sure to generate local.properties using 'android update project'"
+            unless="sdk.dir"
+    />
+
+
+<!-- extension targets. Uncomment the ones where you want to do custom work
+     in between standard targets -->
+<!--
+    <target name="-pre-build">
+    </target>
+    <target name="-pre-compile">
+    </target>
+
+    /* This is typically used for code obfuscation.
+       Compiled code location: ${out.classes.absolute.dir}
+       If this is not done in place, override ${out.dex.input.absolute.dir} */
+    <target name="-post-compile">
+    </target>
+-->
+
+    <!-- Import the actual build file.
+
+         To customize existing targets, there are two options:
+         - Customize only one target:
+             - copy/paste the target into this file, *before* the
+               <import> task.
+             - customize it to your needs.
+         - Customize the whole content of build.xml
+             - copy/paste the content of the rules files (minus the top node)
+               into this file, replacing the <import> task.
+             - customize to your needs.
+
+         ***********************
+         ****** IMPORTANT ******
+         ***********************
+         In all cases you must update the value of version-tag below to read 'custom' instead of an integer,
+         in order to avoid having your file be overridden by tools such as "android update project"
+    -->
+    <!-- version-tag: 1 -->
+    <import file="${android.library.reference.1}/no-resource-compress.xml" />
+</project>
diff --git a/android/experimental/LOAndroid3/dummies.cxx b/android/experimental/LOAndroid3/dummies.cxx
new file mode 100644
index 000000000000..5607ecfd72d6
--- /dev/null
+++ b/android/experimental/LOAndroid3/dummies.cxx
@@ -0,0 +1,75 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+// Dummy implementations of the callback functions in the UI layer
+// that the LO layer calls. As this experimental Android app doesn't
+// handle any of that, these do nothing.
+
+#include <android/log.h>
+
+#include <touch/touch.h>
+
+extern "C"
+__attribute__ ((visibility("default")))
+void
+touch_ui_selection_start(MLOSelectionKind kind,
+                         const void *documentHandle,
+                         MLORect *rectangles,
+                         int rectangleCount,
+                         void *preview)
+{
+}
+
+extern "C"
+__attribute__ ((visibility("default")))
+void
+touch_ui_selection_resize_done(bool success,
+                               const void *documentHandle,
+                               MLORect *rectangles,
+                               int rectangleCount)
+{
+}
+
+extern "C"
+__attribute__ ((visibility("default")))
+void
+touch_ui_selection_none()
+{
+}
+
+
+static const char *
+dialog_kind_to_string(MLODialogKind kind)
+{
+    switch (kind) {
+    case MLODialogMessage:
+        return "MSG";
+    case MLODialogInformation:
+        return "INF";
+    case MLODialogWarning:
+        return "WRN";
+    case MLODialogError:
+        return "ERR";
+    case MLODialogQuery:
+        return "QRY";
+    default:
+        return "WTF";
+    }
+}
+
+extern "C"
+__attribute__ ((visibility("default")))
+MLODialogResult
+touch_ui_dialog_modal(MLODialogKind kind, const char *message)
+{
+    __android_log_print(ANDROID_LOG_INFO, "===>  %s: %s", dialog_kind_to_string(kind), message);
+    return MLODialogOK;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/android/experimental/LOAndroid3/fonts.conf b/android/experimental/LOAndroid3/fonts.conf
new file mode 100644
index 000000000000..263648a0aa87
--- /dev/null
+++ b/android/experimental/LOAndroid3/fonts.conf
@@ -0,0 +1,154 @@
+<?xml version="1.0"?>
+<!DOCTYPE fontconfig SYSTEM "fonts.dtd">
+<!-- /etc/fonts/fonts.conf file to configure system font access -->
+<fontconfig>
+
+<!-- Font directory list -->
+
+	<dir>/system/fonts</dir>
+
+	<alias>
+		<family>serif</family>
+		<prefer>
+			<family>Droid Serif</family>
+		</prefer>
+	</alias>
+	<alias>
+		<family>sans-serif</family>
+		<prefer>
+			<family>Roboto</family>
+			<family>Droid Sans Fallback</family>
+		</prefer>
+	</alias>
+	<alias>
+		<family>monospace</family>
+		<prefer>
+			<family>Droid Sans Mono</family>
+		</prefer>
+	</alias>
+
+<!--
+  Accept deprecated 'mono' alias, replacing it with 'monospace'
+-->
+	<match target="pattern">
+		<test qual="any" name="family">
+			<string>mono</string>
+		</test>
+		<edit name="family" mode="assign">
+			<string>monospace</string>
+		</edit>
+	</match>
+
+<!--
+  Accept alternate 'sans serif' spelling, replacing it with 'sans-serif'
+-->
+	<match target="pattern">
+		<test qual="any" name="family">
+			<string>sans serif</string>
+		</test>
+		<edit name="family" mode="assign">
+			<string>sans-serif</string>
+		</edit>
+	</match>
+
+<!--
+  Accept deprecated 'sans' alias, replacing it with 'sans-serif'
+-->
+	<match target="pattern">
+		<test qual="any" name="family">
+			<string>sans</string>
+		</test>
+		<edit name="family" mode="assign">
+			<string>sans-serif</string>
+		</edit>
+	</match>
+
+<!--
+  Load local system customization file
+-->
+	<include ignore_missing="yes">conf.d</include>
+
+<!-- Font cache directory list -->
+
+	<!-- Yeah this hardcoding is wrong of course, will have to fix
+	     later to patch in proper code in fontonfig on Android to
+	     find out a good place.
+	-->
+	<cachedir>/data/data/org.libreoffice/fontconfig</cachedir>
+
+	<config>
+<!--
+  These are the default Unicode chars that are expected to be blank
+  in fonts.  All other blank chars are assumed to be broken and
+  won't appear in the resulting charsets
+ -->
+		<blank>
+			<int>0x0020</int>	<!-- SPACE -->
+			<int>0x00A0</int>	<!-- NO-BREAK SPACE -->
+			<int>0x00AD</int>	<!-- SOFT HYPHEN -->
+			<int>0x034F</int>	<!-- COMBINING GRAPHEME JOINER -->
+			<int>0x0600</int>	<!-- ARABIC NUMBER SIGN -->
+			<int>0x0601</int>	<!-- ARABIC SIGN SANAH -->
+			<int>0x0602</int>	<!-- ARABIC FOOTNOTE MARKER -->
+			<int>0x0603</int>	<!-- ARABIC SIGN SAFHA -->
+			<int>0x06DD</int>	<!-- ARABIC END OF AYAH -->
+			<int>0x070F</int>	<!-- SYRIAC ABBREVIATION MARK -->
+			<int>0x115F</int>	<!-- HANGUL CHOSEONG FILLER -->
+			<int>0x1160</int>	<!-- HANGUL JUNGSEONG FILLER -->
+			<int>0x1680</int>	<!-- OGHAM SPACE MARK -->
+			<int>0x17B4</int>	<!-- KHMER VOWEL INHERENT AQ -->
+			<int>0x17B5</int>	<!-- KHMER VOWEL INHERENT AA -->
+			<int>0x180E</int>	<!-- MONGOLIAN VOWEL SEPARATOR -->
+			<int>0x2000</int>	<!-- EN QUAD -->
+			<int>0x2001</int>	<!-- EM QUAD -->
+			<int>0x2002</int>	<!-- EN SPACE -->
+			<int>0x2003</int>	<!-- EM SPACE -->
+			<int>0x2004</int>	<!-- THREE-PER-EM SPACE -->
+			<int>0x2005</int>	<!-- FOUR-PER-EM SPACE -->
+			<int>0x2006</int>	<!-- SIX-PER-EM SPACE -->
+			<int>0x2007</int>	<!-- FIGURE SPACE -->
+			<int>0x2008</int>	<!-- PUNCTUATION SPACE -->
+			<int>0x2009</int>	<!-- THIN SPACE -->
+			<int>0x200A</int>	<!-- HAIR SPACE -->
+			<int>0x200B</int>	<!-- ZERO WIDTH SPACE -->
+			<int>0x200C</int>	<!-- ZERO WIDTH NON-JOINER -->
+			<int>0x200D</int>	<!-- ZERO WIDTH JOINER -->
+			<int>0x200E</int>	<!-- LEFT-TO-RIGHT MARK -->
+			<int>0x200F</int>	<!-- RIGHT-TO-LEFT MARK -->
+			<int>0x2028</int>	<!-- LINE SEPARATOR -->
+			<int>0x2029</int>	<!-- PARAGRAPH SEPARATOR -->
+			<int>0x202A</int>	<!-- LEFT-TO-RIGHT EMBEDDING -->
+			<int>0x202B</int>	<!-- RIGHT-TO-LEFT EMBEDDING -->
+			<int>0x202C</int>	<!-- POP DIRECTIONAL FORMATTING -->
+			<int>0x202D</int>	<!-- LEFT-TO-RIGHT OVERRIDE -->
+			<int>0x202E</int>	<!-- RIGHT-TO-LEFT OVERRIDE -->
+			<int>0x202F</int>	<!-- NARROW NO-BREAK SPACE -->
+			<int>0x205F</int>	<!-- MEDIUM MATHEMATICAL SPACE -->
+			<int>0x2060</int>	<!-- WORD JOINER -->
+			<int>0x2061</int>	<!-- FUNCTION APPLICATION -->
+			<int>0x2062</int>	<!-- INVISIBLE TIMES -->
+			<int>0x2063</int>	<!-- INVISIBLE SEPARATOR -->
+			<int>0x206A</int>	<!-- INHIBIT SYMMETRIC SWAPPING -->
+			<int>0x206B</int>	<!-- ACTIVATE SYMMETRIC SWAPPING -->
+			<int>0x206C</int>	<!-- INHIBIT ARABIC FORM SHAPING -->
+			<int>0x206D</int>	<!-- ACTIVATE ARABIC FORM SHAPING -->
+			<int>0x206E</int>	<!-- NATIONAL DIGIT SHAPES -->
+			<int>0x206F</int>	<!-- NOMINAL DIGIT SHAPES -->
+			<int>0x2800</int>	<!-- BRAILLE PATTERN BLANK -->
+			<int>0x3000</int>	<!-- IDEOGRAPHIC SPACE -->
+			<int>0x3164</int>	<!-- HANGUL FILLER -->
+			<int>0xFEFF</int>	<!-- ZERO WIDTH NO-BREAK SPACE -->
+			<int>0xFFA0</int>	<!-- HALFWIDTH HANGUL FILLER -->
+			<int>0xFFF9</int>	<!-- INTERLINEAR ANNOTATION ANCHOR -->
+			<int>0xFFFA</int>	<!-- INTERLINEAR ANNOTATION SEPARATOR -->
+			<int>0xFFFB</int>	<!-- INTERLINEAR ANNOTATION TERMINATOR -->
+		</blank>
+<!--
+  Rescan configuration every 3600 seconds when FcFontSetList is called
+ -->
+		<rescan>
+			<int>3600</int>
+		</rescan>
+	</config>
+
+</fontconfig>
diff --git a/android/experimental/LOAndroid3/jni/Android.mk b/android/experimental/LOAndroid3/jni/Android.mk
new file mode 100644
index 000000000000..939a1ea503bb
--- /dev/null
+++ b/android/experimental/LOAndroid3/jni/Android.mk
@@ -0,0 +1,8 @@
+# Needed just to satisfy ndk-gdb for now, but maybe later we will actually add
+# some JNI code here
+
+LOCAL_PATH := $(call my-dir)
+
+include $(CLEAR_VARS)
+
+include $(BUILD_SHARED_LIBRARY)
diff --git a/android/experimental/LOAndroid3/proguard-project.txt b/android/experimental/LOAndroid3/proguard-project.txt
new file mode 100644
index 000000000000..f2fe1559a217
--- /dev/null
+++ b/android/experimental/LOAndroid3/proguard-project.txt
@@ -0,0 +1,20 @@
+# To enable ProGuard in your project, edit project.properties
+# to define the proguard.config property as described in that file.
+#
+# Add project specific ProGuard rules here.
+# By default, the flags in this file are appended to flags specified
+# in ${sdk.dir}/tools/proguard/proguard-android.txt
+# You can edit the include path and order by changing the ProGuard
+# include property in project.properties.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# Add any project specific keep options here:
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
diff --git a/android/experimental/LOAndroid3/project.properties b/android/experimental/LOAndroid3/project.properties
new file mode 100644
index 000000000000..772d3c57623c
--- /dev/null
+++ b/android/experimental/LOAndroid3/project.properties
@@ -0,0 +1,14 @@
+# This file is automatically generated by Android Tools.
+# Do not modify this file -- YOUR CHANGES WILL BE ERASED!
+#
+# This file must be checked in Version Control Systems.
+#
+# To customize properties used by the Ant build system use,
+# "ant.properties", and override values to adapt the script to your
+# project structure.
+
+# Project target.
+target=android-15
+
+# Use the Bootstrap class
+android.library.reference.1=../../Bootstrap
diff --git a/android/experimental/LOAndroid3/res/drawable-hdpi/base.png b/android/experimental/LOAndroid3/res/drawable-hdpi/base.png
new file mode 100644
index 000000000000..729dbcd82ebf
--- /dev/null
+++ b/android/experimental/LOAndroid3/res/drawable-hdpi/base.png
diff --git a/android/experimental/LOAndroid3/res/drawable-hdpi/calc.png b/android/experimental/LOAndroid3/res/drawable-hdpi/calc.png
new file mode 100644
index 000000000000..a3f5fd4d80c0
--- /dev/null
+++ b/android/experimental/LOAndroid3/res/drawable-hdpi/calc.png
diff --git a/android/experimental/LOAndroid3/res/drawable-hdpi/draw.png b/android/experimental/LOAndroid3/res/drawable-hdpi/draw.png
new file mode 100644
index 000000000000..b3ee11426a04
--- /dev/null
+++ b/android/experimental/LOAndroid3/res/drawable-hdpi/draw.png
diff --git a/android/experimental/LOAndroid3/res/drawable-hdpi/dummy_page.png b/android/experimental/LOAndroid3/res/drawable-hdpi/dummy_page.png
new file mode 100644
index 000000000000..c58d276e7085
--- /dev/null
+++ b/android/experimental/LOAndroid3/res/drawable-hdpi/dummy_page.png
diff --git a/android/experimental/LOAndroid3/res/drawable-hdpi/ic_launcher.png b/android/experimental/LOAndroid3/res/drawable-hdpi/ic_launcher.png
new file mode 100644
index 000000000000..96a442e5b8e9
--- /dev/null
+++ b/android/experimental/LOAndroid3/res/drawable-hdpi/ic_launcher.png
diff --git a/android/experimental/LOAndroid3/res/drawable-hdpi/ic_status_logo.png b/android/experimental/LOAndroid3/res/drawable-hdpi/ic_status_logo.png
new file mode 100644
index 000000000000..d5f16694f342
--- /dev/null
+++ b/android/experimental/LOAndroid3/res/drawable-hdpi/ic_status_logo.png
diff --git a/android/experimental/LOAndroid3/res/drawable-hdpi/impress.png b/android/experimental/LOAndroid3/res/drawable-hdpi/impress.png
new file mode 100644
index 000000000000..5909f05bf089
--- /dev/null
+++ b/android/experimental/LOAndroid3/res/drawable-hdpi/impress.png
diff --git a/android/experimental/LOAndroid3/res/drawable-hdpi/lo_icon.png b/android/experimental/LOAndroid3/res/drawable-hdpi/lo_icon.png
new file mode 100644
index 000000000000..2ef86417e69e
--- /dev/null
+++ b/android/experimental/LOAndroid3/res/drawable-hdpi/lo_icon.png
diff --git a/android/experimental/LOAndroid3/res/drawable-hdpi/main.png b/android/experimental/LOAndroid3/res/drawable-hdpi/main.png
new file mode 100644
index 000000000000..7e8e2a05e2da
--- /dev/null
+++ b/android/experimental/LOAndroid3/res/drawable-hdpi/main.png
diff --git a/android/experimental/LOAndroid3/res/drawable-hdpi/math.png b/android/experimental/LOAndroid3/res/drawable-hdpi/math.png
new file mode 100644
index 000000000000..50b8dc863bff
--- /dev/null
+++ b/android/experimental/LOAndroid3/res/drawable-hdpi/math.png
diff --git a/android/experimental/LOAndroid3/res/drawable-hdpi/startcenter.png b/android/experimental/LOAndroid3/res/drawable-hdpi/startcenter.png
new file mode 100644
index 000000000000..7e8e2a05e2da
--- /dev/null
+++ b/android/experimental/LOAndroid3/res/drawable-hdpi/startcenter.png
diff --git a/android/experimental/LOAndroid3/res/drawable-mdpi/background.png b/android/experimental/LOAndroid3/res/drawable-mdpi/background.png
new file mode 100644
index 000000000000..611592b5167a
--- /dev/null
+++ b/android/experimental/LOAndroid3/res/drawable-mdpi/background.png
diff --git a/android/experimental/LOAndroid3/res/drawable-mdpi/base.png b/android/experimental/LOAndroid3/res/drawable-mdpi/base.png
new file mode 100644
index 000000000000..729dbcd82ebf
--- /dev/null
+++ b/android/experimental/LOAndroid3/res/drawable-mdpi/base.png
diff --git a/android/experimental/LOAndroid3/res/drawable-mdpi/calc.png b/android/experimental/LOAndroid3/res/drawable-mdpi/calc.png
new file mode 100644
index 000000000000..a3f5fd4d80c0
--- /dev/null
+++ b/android/experimental/LOAndroid3/res/drawable-mdpi/calc.png
diff --git a/android/experimental/LOAndroid3/res/drawable-mdpi/docu.png b/android/experimental/LOAndroid3/res/drawable-mdpi/docu.png
new file mode 100644
index 000000000000..ab34ae5638e1
--- /dev/null
+++ b/android/experimental/LOAndroid3/res/drawable-mdpi/docu.png
diff --git a/android/experimental/LOAndroid3/res/drawable-mdpi/draw.png b/android/experimental/LOAndroid3/res/drawable-mdpi/draw.png
new file mode 100644
index 000000000000..b3ee11426a04
--- /dev/null
+++ b/android/experimental/LOAndroid3/res/drawable-mdpi/draw.png
diff --git a/android/experimental/LOAndroid3/res/drawable-mdpi/ic_launcher.png b/android/experimental/LOAndroid3/res/drawable-mdpi/ic_launcher.png
new file mode 100644
index 000000000000..359047dfa4ed
--- /dev/null
+++ b/android/experimental/LOAndroid3/res/drawable-mdpi/ic_launcher.png
diff --git a/android/experimental/LOAndroid3/res/drawable-mdpi/ic_status_logo.png b/android/experimental/LOAndroid3/res/drawable-mdpi/ic_status_logo.png
new file mode 100644
index 000000000000..835fc9290727
--- /dev/null
+++ b/android/experimental/LOAndroid3/res/drawable-mdpi/ic_status_logo.png
diff --git a/android/experimental/LOAndroid3/res/drawable-mdpi/impress.png b/android/experimental/LOAndroid3/res/drawable-mdpi/impress.png
new file mode 100644
index 000000000000..5909f05bf089
--- /dev/null
+++ b/android/experimental/LOAndroid3/res/drawable-mdpi/impress.png
diff --git a/android/experimental/LOAndroid3/res/drawable-mdpi/lo_icon.png b/android/experimental/LOAndroid3/res/drawable-mdpi/lo_icon.png
new file mode 100644
index 000000000000..4f3f89beadc2
--- /dev/null
+++ b/android/experimental/LOAndroid3/res/drawable-mdpi/lo_icon.png
diff --git a/android/experimental/LOAndroid3/res/drawable-mdpi/shadow.png b/android/experimental/LOAndroid3/res/drawable-mdpi/shadow.png
new file mode 100644
index 000000000000..3ce69155c6b5
--- /dev/null
+++ b/android/experimental/LOAndroid3/res/drawable-mdpi/shadow.png
diff --git a/android/experimental/LOAndroid3/res/drawable-mdpi/writer.png b/android/experimental/LOAndroid3/res/drawable-mdpi/writer.png
new file mode 100644
index 000000000000..2f4abcb280cd
--- /dev/null
+++ b/android/experimental/LOAndroid3/res/drawable-mdpi/writer.png
diff --git a/android/experimental/LOAndroid3/res/drawable-xhdpi/base.png b/android/experimental/LOAndroid3/res/drawable-xhdpi/base.png
new file mode 100644
index 000000000000..729dbcd82ebf
--- /dev/null
+++ b/android/experimental/LOAndroid3/res/drawable-xhdpi/base.png
diff --git a/android/experimental/LOAndroid3/res/drawable-xhdpi/calc.png b/android/experimental/LOAndroid3/res/drawable-xhdpi/calc.png
new file mode 100644
index 000000000000..a3f5fd4d80c0
--- /dev/null
+++ b/android/experimental/LOAndroid3/res/drawable-xhdpi/calc.png
diff --git a/android/experimental/LOAndroid3/res/drawable-xhdpi/draw.png b/android/experimental/LOAndroid3/res/drawable-xhdpi/draw.png
new file mode 100644
index 000000000000..b3ee11426a04
--- /dev/null
+++ b/android/experimental/LOAndroid3/res/drawable-xhdpi/draw.png
diff --git a/android/experimental/LOAndroid3/res/drawable-xhdpi/ic_launcher.png b/android/experimental/LOAndroid3/res/drawable-xhdpi/ic_launcher.png
new file mode 100644
index 000000000000..71c6d760f051
--- /dev/null
+++ b/android/experimental/LOAndroid3/res/drawable-xhdpi/ic_launcher.png
diff --git a/android/experimental/LOAndroid3/res/drawable-xhdpi/ic_status_logo.png b/android/experimental/LOAndroid3/res/drawable-xhdpi/ic_status_logo.png
new file mode 100644
index 000000000000..c8005425416a
--- /dev/null
+++ b/android/experimental/LOAndroid3/res/drawable-xhdpi/ic_status_logo.png
diff --git a/android/experimental/LOAndroid3/res/drawable-xhdpi/impress.png b/android/experimental/LOAndroid3/res/drawable-xhdpi/impress.png
new file mode 100644
index 000000000000..5909f05bf089
--- /dev/null
+++ b/android/experimental/LOAndroid3/res/drawable-xhdpi/impress.png
diff --git a/android/experimental/LOAndroid3/res/drawable-xhdpi/writer.png b/android/experimental/LOAndroid3/res/drawable-xhdpi/writer.png
new file mode 100644
index 000000000000..2f4abcb280cd
--- /dev/null
+++ b/android/experimental/LOAndroid3/res/drawable-xhdpi/writer.png
diff --git a/android/experimental/LOAndroid3/res/drawable-xxhdpi/ic_launcher.png b/android/experimental/LOAndroid3/res/drawable-xxhdpi/ic_launcher.png
new file mode 100644
index 000000000000..4df18946442e
--- /dev/null
+++ b/android/experimental/LOAndroid3/res/drawable-xxhdpi/ic_launcher.png
diff --git a/android/experimental/LOAndroid3/res/layout/activity_main.xml b/android/experimental/LOAndroid3/res/layout/activity_main.xml
new file mode 100644
index 000000000000..7b53d58a2b5c
--- /dev/null
+++ b/android/experimental/LOAndroid3/res/layout/activity_main.xml
@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/main_layout"
+    android:background="#fff"
+    android:layout_width="fill_parent"
+    android:layout_height="fill_parent">
+
+    <RelativeLayout
+        android:id="@+id/gecko_layout"
+        android:layout_width="fill_parent"
+        android:layout_height="fill_parent"
+        android:layout_weight="1"/>
+
+</LinearLayout>
\ No newline at end of file
diff --git a/android/experimental/LOAndroid3/res/menu/main.xml b/android/experimental/LOAndroid3/res/menu/main.xml
new file mode 100644
index 000000000000..e9709c90d729
--- /dev/null
+++ b/android/experimental/LOAndroid3/res/menu/main.xml
@@ -0,0 +1,8 @@
+<menu xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    tools:context="org.libreoffice.MainActivity" >
+    <item android:id="@+id/action_settings"
+        android:title="@string/action_settings"
+        android:orderInCategory="100" />
+</menu>
diff --git a/android/experimental/LOAndroid3/res/values/colors.xml b/android/experimental/LOAndroid3/res/values/colors.xml
new file mode 100644
index 000000000000..f8e207d4e00e
--- /dev/null
+++ b/android/experimental/LOAndroid3/res/values/colors.xml
@@ -0,0 +1,95 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- This Source Code Form is subject to the terms of the Mozilla Public
+   - License, v. 2.0. If a copy of the MPL was not distributed with this
+   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
+
+<resources>
+  <color name="background_light">#FFECF0F3</color>
+  <color name="background_normal">#FFCED7DE</color>
+  <color name="background_private">#FF292C29</color>
+  <color name="background_tabs">#FF363B40</color>
+  <color name="highlight">#33000000</color>
+  <color name="highlight_focused">#1A000000</color>
+  <color name="highlight_dark">#33FFFFFF</color>
+  <color name="highlight_dark_focused">#1AFFFFFF</color>
+
+  <!-- highlight on shaped button: 20% white over background_tabs -->
+  <color name="highlight_shaped">#FF696D71</color>
+
+  <!-- highlight-focused on shaped button: 10% white over background_tabs -->
+  <color name="highlight_shaped_focused">#FF565B60</color>
+
+  <!-- highlight on nav button: 20% black over background_normal -->
+  <color name="highlight_nav">#FFA5ACB2</color>
+
+  <!-- highlight-focused on nav button: 10% black over background_normal -->
+  <color name="highlight_nav_focused">#FFB9C1C7</color>
+
+  <!-- highlight on private nav button: 20% white over background_private -->
+  <color name="highlight_nav_pb">#FF545654</color>
+
+  <!-- highlight-focused on private nav button: 10% white over background_private -->
+  <color name="highlight_nav_focused_pb">#FF3F423F</color>
+
+  <!--
+      Application theme colors
+  -->
+  <!-- Default colors -->
+  <color name="text_color_primary">#222222</color>
+  <color name="text_color_secondary">#777777</color>
+  <color name="text_color_tertiary">#9198A1</color>
+
+  <!-- Default inverse colors -->
+  <color name="text_color_primary_inverse">#FFFFFF</color>
+  <color name="text_color_secondary_inverse">#DDDDDD</color>
+  <color name="text_color_tertiary_inverse">#A4A7A9</color>
+
+  <!-- Disabled colors -->
+  <color name="text_color_primary_disable_only">#999999</color>
+
+  <!-- Hint colors -->
+  <color name="text_color_hint">#666666</color>
+  <color name="text_color_hint_inverse">#7F828A</color>
+
+  <!-- Highlight colors -->
+  <color name="text_color_highlight">#FF9500</color>
+  <color name="text_color_highlight_inverse">#D06BFF</color>
+
+  <!-- Link colors -->
+  <color name="text_color_link">#22629E</color>
+
+  <color name="splash_background">#000000</color>
+  <color name="splash_msgfont">#ffffff</color>
+  <color name="splash_urlfont">#000000</color>
+  <color name="splash_content">#ffffff</color>
+
+  <color name="doorhanger_text">#FF222222</color>
+  <color name="doorhanger_link">#FF2AA1FE</color>
+  <color name="doorhanger_divider_light">#FFD1D5DA</color>
+  <color name="doorhanger_divider_dark">#FFB3C2CE</color>
+  <color name="doorhanger_background_dark">#FFDDE4EA</color>
+
+  <color name="validation_message_text">#ffffff</color>
+  <color name="url_bar_text_highlight">#FFFF9500</color>
+  <color name="url_bar_text_highlight_pb">#FFD06BFF</color>
+  <color name="suggestion_primary">#dddddd</color>
+  <color name="suggestion_pressed">#bbbbbb</color>
+  <color name="tab_row_pressed">#4D000000</color>
+  <color name="dialogtitle_textcolor">#ffffff</color>
+
+  <color name="textbox_background">#FFF</color>
+  <color name="textbox_background_disabled">#DDD</color>
+  <color name="textbox_stroke">#000</color>
+  <color name="textbox_stroke_disabled">#666</color>
+
+  <color name="url_bar_urltext">#A6A6A6</color>
+  <color name="url_bar_domaintext">#000</color>
+  <color name="url_bar_domaintext_private">#FFF</color>
+  <color name="url_bar_blockedtext">#b14646</color>
+  <color name="url_bar_shadow">#12000000</color>
+
+  <color name="home_last_tab_bar_bg">#FFF5F7F9</color>
+
+  <color name="panel_grid_item_image_background">#D1D9E1</color>
+</resources>
+
diff --git a/android/experimental/LOAndroid3/res/values/dimens.xml b/android/experimental/LOAndroid3/res/values/dimens.xml
new file mode 100644
index 000000000000..47c82246738c
--- /dev/null
+++ b/android/experimental/LOAndroid3/res/values/dimens.xml
@@ -0,0 +1,5 @@
+<resources>
+    <!-- Default screen margins, per the Android Design guidelines. -->
+    <dimen name="activity_horizontal_margin">16dp</dimen>
+    <dimen name="activity_vertical_margin">16dp</dimen>
+</resources>
diff --git a/android/experimental/LOAndroid3/res/values/strings.xml b/android/experimental/LOAndroid3/res/values/strings.xml
new file mode 100644
index 000000000000..93431ed24788
--- /dev/null
+++ b/android/experimental/LOAndroid3/res/values/strings.xml
@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+
+    <string name="app_name">LibreOffice</string>
+    <string name="action_settings">Settings</string>
+
+</resources>
diff --git a/android/experimental/LOAndroid3/res/values/styles.xml b/android/experimental/LOAndroid3/res/values/styles.xml
new file mode 100644
index 000000000000..ff6c9d2c0fb9
--- /dev/null
+++ b/android/experimental/LOAndroid3/res/values/styles.xml
@@ -0,0 +1,8 @@
+<resources>
+
+    <!-- Base application theme. -->
+    <style name="AppTheme" parent="android:Theme.Holo.Light.DarkActionBar">
+        <!-- Customize your theme here. -->
+    </style>
+
+</resources>
diff --git a/android/experimental/LOAndroid3/src/java/org/libreoffice/LOEvent.java b/android/experimental/LOAndroid3/src/java/org/libreoffice/LOEvent.java
new file mode 100644
index 000000000000..bf4f98b845da
--- /dev/null
+++ b/android/experimental/LOAndroid3/src/java/org/libreoffice/LOEvent.java
@@ -0,0 +1,67 @@
+package org.libreoffice;
+
+import android.graphics.Rect;
+import android.util.Log;
+
+import org.mozilla.gecko.gfx.IntSize;
+import org.mozilla.gecko.gfx.ViewportMetrics;
+
+public class LOEvent {
+
+    public static final int SIZE_CHANGED = 1;
+    public static final int TILE_SIZE = 2;
+    public static final int VIEWPORT = 3;
+    public static final int DRAW = 4;
+
+    private ViewportMetrics mViewportMetrics;
+
+    public int mType;
+    private String mTypeString;
+
+    ViewportMetrics viewportMetrics;
+
+    public LOEvent(int type, int width, int height, int widthPixels, int heightPixels, int tileWidth, int tileHeight) {
+        mType = type;
+        mTypeString = "Size Changed";
+    }
+
+    public LOEvent(int type, IntSize tileSize) {
+        mType = type;
+        mTypeString = "Tile size";
+    }
+
+    public LOEvent(int type, ViewportMetrics viewportMetrics) {
+        mType = type;
+        mTypeString = "Viewport";
+        mViewportMetrics = viewportMetrics;
+    }
+
+    public LOEvent(int type, Rect rect) {
+        mType = type;
+        mTypeString = "Draw";
+    }
+
+    public static LOEvent draw(Rect rect) {
+        return new LOEvent(DRAW, rect);
+    }
+
+    public static LOEvent sizeChanged(int width, int height, int widthPixels, int heightPixels, int tileWidth, int tileHeight) {
+        return new LOEvent(SIZE_CHANGED, width, height, widthPixels, heightPixels, tileWidth, tileHeight);
+    }
+
+    public static LOEvent tileSize(IntSize tileSize) {
+        return new LOEvent(TILE_SIZE, tileSize);
+    }
+
+    public static LOEvent viewport(ViewportMetrics viewportMetrics) {
+        return new LOEvent(VIEWPORT, viewportMetrics);
+    }
+
+    public String getTypeString() {
+        return mTypeString;
+    }
+
+    public ViewportMetrics getViewport() {
+        return mViewportMetrics;
+    }
+}
diff --git a/android/experimental/LOAndroid3/src/java/org/libreoffice/LOKitShell.java b/android/experimental/LOAndroid3/src/java/org/libreoffice/LOKitShell.java
new file mode 100644
index 000000000000..9dde7906d020
--- /dev/null
+++ b/android/experimental/LOAndroid3/src/java/org/libreoffice/LOKitShell.java
@@ -0,0 +1,131 @@
+package org.libreoffice;
+
+
+import android.util.DisplayMetrics;
+import android.util.Log;
+import android.view.MotionEvent;
+import android.view.View;
+
+import org.mozilla.gecko.gfx.GeckoSoftwareLayerClient;
+import org.mozilla.gecko.gfx.IntSize;
+import org.mozilla.gecko.gfx.LayerController;
+import org.mozilla.gecko.gfx.LayerView;
+
+import java.nio.ByteBuffer;
+
+public class LOKitShell {
+    private static final String LOGTAG = LOKitShell.class.getSimpleName();
+
+    public static int getDpi() {
+        return 96;
+    }
+
+    public static int getScreenDepth() {
+        return 24;
+    }
+
+    public static float computeRenderIntegrity() {
+        return 0.0f;
+    }
+
+    public static ByteBuffer allocateDirectBuffer(int size) {
+        if (size <= 0) {
+            throw new IllegalArgumentException("Invalid size " + size);
+        }
+
+        ByteBuffer directBuffer = ByteBuffer.allocateDirect(size);
+        //ByteBuffer directBuffer = nativeAllocateDirectBuffer(size);
+        if (directBuffer == null) {
+            throw new OutOfMemoryError("allocateDirectBuffer() returned null");
+        } else if (!directBuffer.isDirect()) {
+            throw new AssertionError("allocateDirectBuffer() did not return a direct buffer");
+        }
+
+        return directBuffer;
+    }
+
+
+    public static void freeDirectBuffer(ByteBuffer buffer) {
+        if (buffer == null) {
+            return;
+        }
+
+        if (!buffer.isDirect()) {
+            throw new IllegalArgumentException("buffer must be direct");
+        }
+        //nativeFreeDirectBuffer(buffer);
+        return ;
+    }
+
+    public static void bindWidgetTexture() {
+    }
+
+    public static void sendEvent(LOEvent event) {
+        Log.i(LOGTAG, "Event: " + event.getTypeString());
+    }
+
+    public static void runGecko(String apkPath, String args, String url, boolean restoreSession) {
+        // run gecko -- it will spawn its own thread
+        // GeckoAppShell.nativeInit();
+
+        Log.i(LOGTAG, "post native init");
+
+        // Tell Gecko where the target byte buffer is for rendering
+        //GeckoAppShell.setSoftwareLayerClient(GeckoApp.mAppContext.getSoftwareLayerClient());
+
+        Log.i(LOGTAG, "setSoftwareLayerClient called");
+
+        // First argument is the .apk path
+        String combinedArgs = apkPath + " -greomni " + apkPath;
+        if (args != null)
+            combinedArgs += " " + args;
+        if (url != null)
+            combinedArgs += " -remote " + url;
+        if (restoreSession)
+            combinedArgs += " -restoresession";
+
+        DisplayMetrics metrics = new DisplayMetrics();
+        LibreOfficeMainActivity.mAppContext.getWindowManager().getDefaultDisplay().getMetrics(metrics);
+        combinedArgs += " -width " + metrics.widthPixels + " -height " + metrics.heightPixels;
+
+        LibreOfficeMainActivity.mAppContext.runOnUiThread(new Runnable() {
+            public void run() {
+                geckoLoaded();
+            }
+        });
+
+        //LOKitShell.nativeRun(combinedArgs);
+    }
+
+    // Called on the UI thread after Gecko loads.
+    private static void geckoLoaded() {
+        /*final LayerController layerController = LibreOfficeMainActivity.mAppContext.getLayerController();
+        LayerView v = layerController.getView();
+        mInputConnection = GeckoInputConnection.create(v);
+        v.setInputConnectionHandler(mInputConnection);
+
+        layerController.setOnTouchListener(new View.OnTouchListener() {
+            public boolean onTouch(View view, MotionEvent event) {
+                if (event == null)
+                    return true;
+                GeckoAppShell.sendEventToGecko(new GeckoEvent(event));
+                return true;
+            }
+        });
+
+        layerController.notifyLayerClientOfGeometryChange();*/
+    }
+
+    public static void viewSizeChanged() {
+    }
+
+    public static void scheduleComposite() {
+    }
+
+    public static void schedulePauseComposition() {
+    }
+
+    public static void scheduleResumeComposition() {
+
+    }
+}
diff --git a/android/experimental/LOAndroid3/src/java/org/libreoffice/LOKitThread.java b/android/experimental/LOAndroid3/src/java/org/libreoffice/LOKitThread.java
new file mode 100644
index 000000000000..ea3472b8c52c
--- /dev/null
+++ b/android/experimental/LOAndroid3/src/java/org/libreoffice/LOKitThread.java
@@ -0,0 +1,135 @@
+package org.libreoffice;
+
+import android.graphics.Bitmap;
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.graphics.Paint;
+import android.graphics.Rect;
+import android.util.JsonWriter;
+
+import org.mozilla.gecko.gfx.ViewportMetrics;
+
+import java.io.IOException;
+import java.io.StringWriter;
+import java.nio.ByteBuffer;
+import java.util.Random;
+import java.util.concurrent.ConcurrentLinkedQueue;
+
+public class LOKitThread extends Thread {
+    private static final String LOGTAG = "GeckoThread";
+
+    public ConcurrentLinkedQueue<LOEvent> gEvents = new ConcurrentLinkedQueue<LOEvent>();
+    private ViewportMetrics mViewportMetrics;
+    private Random rand = new Random();
+
+    LOKitThread() {
+    }
+
+    private boolean draw() throws InterruptedException {
+        final LibreOfficeMainActivity application = LibreOfficeMainActivity.mAppContext;
+
+        Bitmap bitmap = application.getLayerClient().getLayerController().getDrawable("docu");
+        //bitmap = convert(bitmap, Bitmap.Config.ARGB_8888);
+
+        StringWriter stringWriter = new StringWriter();
+
+        try {
+            JsonWriter writer = new JsonWriter(stringWriter);
+            writer.beginObject();
+            if (mViewportMetrics == null) {
+                writer.name("x").value(0);
+                writer.name("y").value(0);
+                writer.name("width").value(bitmap.getWidth());
+                writer.name("height").value(bitmap.getHeight());
+                writer.name("pageWidth").value(bitmap.getWidth());
+                writer.name("pageHeight").value(bitmap.getHeight());
+                writer.name("offsetX").value(0);
+                writer.name("offsetY").value(0);
+                writer.name("zoom").value(0.5);
+            } else {
+                writer.name("x").value(mViewportMetrics.getOrigin().x);
+                writer.name("y").value(mViewportMetrics.getOrigin().y);
+                writer.name("width").value(mViewportMetrics.getSize().width);
+                writer.name("height").value(mViewportMetrics.getSize().height);
+                writer.name("pageWidth").value(mViewportMetrics.getPageSize().width);
+                writer.name("pageHeight").value(mViewportMetrics.getPageSize().height);
+                writer.name("offsetX").value(mViewportMetrics.getViewportOffset().x);
+                writer.name("offsetY").value(mViewportMetrics.getViewportOffset().y);
+                writer.name("zoom").value(mViewportMetrics.getZoomFactor());
+            }
+            writer.name("backgroundColor").value("rgb(255,255,255)");
+            writer.endObject();
+            writer.close();
+        } catch (IOException ex) {
+        }
+
+        Rect bufferRect = application.getLayerClient().beginDrawing(bitmap.getWidth(), bitmap.getHeight(), 256, 256, stringWriter.toString(), false);
+
+        if (bufferRect == null) {
+            return false;
+        }
+            ByteBuffer buffer = application.getLayerClient().lockBuffer();
+            bitmap.copyPixelsToBuffer(buffer.asIntBuffer());
+            application.getLayerClient().unlockBuffer();
+
+            application.getLayerClient().endDrawing(0, 0, bitmap.getWidth(), bitmap.getHeight());
+
+            application.runOnUiThread(new Runnable() {
+                @Override
+                public void run() {
+                    application.getLayerClient().handleMessage("Viewport:UpdateLater", null);
+                }
+            });
+        return true;
+    }
+
+    private short convertTo16Bit(int color) {
+        int r = Color.red(color) >> 3, g = Color.green(color) >> 2, b = Color.blue(color) >> 3;
+        int c = ((r << 11) | (g << 5) | b);
+        // Swap endianness.
+        return (short) ((c >> 8) | ((c & 0xff) << 8));
+    }
+
+    private Bitmap convert(Bitmap bitmap, Bitmap.Config config) {
+        Bitmap convertedBitmap = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), config);
+        Canvas canvas = new Canvas(convertedBitmap);
+        Paint paint = new Paint();
+        paint.setColor(Color.BLACK);
+        canvas.drawBitmap(bitmap, 0, 0, paint);
+        return convertedBitmap;
+    }
+
+
+    public void run() {
+        try {
+            boolean drawn = false;
+            while (true) {
+
+                if (!gEvents.isEmpty()) {
+                    processEvent(gEvents.poll());
+                } else {
+                    if (!drawn) {
+                        drawn = draw();
+                    }
+                    Thread.sleep(100L);
+                }
+            }
+        } catch (InterruptedException ex) {
+        }
+    }
+
+    private void processEvent(LOEvent event) throws InterruptedException {
+        switch (event.mType) {
+            case LOEvent.VIEWPORT:
+                mViewportMetrics = event.getViewport();
+                break;
+            case LOEvent.DRAW:
+                draw();
+                break;
+            case LOEvent.SIZE_CHANGED:
+                break;
+        }
+    }
+
+
+}
diff --git a/android/experimental/LOAndroid3/src/java/org/libreoffice/LibreOfficeMainActivity.java b/android/experimental/LOAndroid3/src/java/org/libreoffice/LibreOfficeMainActivity.java
new file mode 100644
index 000000000000..d4758443bf13
--- /dev/null
+++ b/android/experimental/LOAndroid3/src/java/org/libreoffice/LibreOfficeMainActivity.java
@@ -0,0 +1,145 @@
+package org.libreoffice;
+
+import android.app.Activity;
+import android.os.Bundle;
+import android.os.SystemClock;
+import android.util.DisplayMetrics;
+import android.util.Log;
+import android.view.Menu;
+import android.view.MenuItem;
+import android.view.MotionEvent;
+import android.view.View;
+import android.widget.LinearLayout;
+import android.widget.RelativeLayout;
+
+import org.mozilla.gecko.gfx.GeckoSoftwareLayerClient;
+import org.mozilla.gecko.gfx.LayerController;
+import org.mozilla.gecko.gfx.LayerView;
+
+import org.libreoffice.android.Bootstrap;
+
+import com.sun.star.frame.XComponentLoader;
+import com.sun.star.lang.XMultiComponentFactory;
+import com.sun.star.uno.XComponentContext;
+import com.sun.star.uno.UnoRuntime;
+
+public class LibreOfficeMainActivity extends Activity {
+
+    private static final String LOGTAG = "LibreOfficeMainActivity";
+
+    private LinearLayout mMainLayout;
+    private RelativeLayout mGeckoLayout;
+    private static LayerController mLayerController;
+    private static GeckoSoftwareLayerClient mLayerClient;
+    private static LOKitThread sLOKitThread;
+
+    private XComponentContext context;
+    private XMultiComponentFactory mcf;
+    private XComponentLoader componentLoader;
+
+    public static LibreOfficeMainActivity mAppContext;
+
+    @Override
+    public boolean onCreateOptionsMenu(Menu menu) {
+        // Inflate the menu; this adds items to the action bar if it is present.
+        getMenuInflater().inflate(R.menu.main, menu);
+        return true;
+    }
+
+    @Override
+    public boolean onOptionsItemSelected(MenuItem item) {
+        // Handle action bar item clicks here. The action bar will
+        // automatically handle clicks on the Home/Up button, so long
+        // as you specify a parent activity in AndroidManifest.xml.
+        int id = item.getItemId();
+        if (id == R.id.action_settings) {
+            return true;
+        }
+        return super.onOptionsItemSelected(item);
+    }
+
+    public DisplayMetrics getDisplayMetrics() {
+        DisplayMetrics metrics = new DisplayMetrics();
+        getWindowManager().getDefaultDisplay().getMetrics(metrics);
+        return metrics;
+    }
+
+    /**
+     * Called when the activity is first created.
+     */
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        mAppContext = this;
+
+        super.onCreate(savedInstanceState);
+
+        try {
+            Bootstrap.setup(this);
+            Bootstrap.putenv("SAL_LOG=+WARN+INFO-INFO.legacy.osl");
+
+            setContentView(R.layout.activity_main);
+
+            Log.w(LOGTAG, "zerdatime " + SystemClock.uptimeMillis() + " - onCreate");
+
+            String input = "/assets/test1.odt";
+
+            String[] argv = { "lo-document-loader", input };
+
+            Bootstrap.setCommandArgs(argv);
+
+            Bootstrap.initVCL();
+
+            context = com.sun.star.comp.helper.Bootstrap.defaultBootstrap_InitialComponentContext();
+
+            Log.i(LOGTAG, "context is" + (context!=null ? " not" : "") + " null");
+
+            mcf = context.getServiceManager();
+
+            Log.i(LOGTAG, "mcf is" + (mcf!=null ? " not" : "") + " null");
+
+            Object desktop = mcf.createInstanceWithContext("com.sun.star.frame.Desktop", context);
+            Log.i(LOGTAG, "desktop is" + (desktop!=null ? " not" : "") + " null");
+
+            componentLoader = (XComponentLoader) UnoRuntime.queryInterface(XComponentLoader.class, desktop);
+            Log.i(LOGTAG, "componentLoader is" + (componentLoader!=null ? " not" : "") + " null");
+
+        } catch (Exception e) {
+            e.printStackTrace(System.err);
+            //finish();
+        }
+
+        setContentView(R.layout.activity_main);
+
+        // setup gecko layout
+        mGeckoLayout = (RelativeLayout) findViewById(R.id.gecko_layout);
+        mMainLayout = (LinearLayout) findViewById(R.id.main_layout);
+
+
+        if (mLayerController == null) {
+            mLayerController = new LayerController(this);
+
+            Log.e(LOGTAG, "### Creating GeckoSoftwareLayerClient");
+            mLayerClient = new GeckoSoftwareLayerClient(this);
+            Log.e(LOGTAG, "### Done creating GeckoSoftwareLayerClient");
+
+            mLayerController.setLayerClient(mLayerClient);
+            mGeckoLayout.addView(mLayerController.getView(), 0);
+        }
+
+        mLayerController.notifyLayerClientOfGeometryChange();
+
+        sLOKitThread = new LOKitThread();
+        sLOKitThread.start();
+
+
+        Log.w(LOGTAG, "zerdatime " + SystemClock.uptimeMillis() + " - UI almost up");
+    }
+
+    public static GeckoSoftwareLayerClient getLayerClient() {
+        return mLayerClient;
+    }
+
+    public static LayerController getLayerController() {
+        return mLayerController;
+    }
+}
diff --git a/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/GeckoEventListener.java b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/GeckoEventListener.java
new file mode 100644
index 000000000000..670513f2cfb2
--- /dev/null
+++ b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/GeckoEventListener.java
@@ -0,0 +1,44 @@
+/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
+ * ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Mozilla Android code.
+ *
+ * The Initial Developer of the Original Code is Mozilla Foundation.
+ * Portions created by the Initial Developer are Copyright (C) 2009-2010
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Sriram Ramasubramanian <sriram@mozilla.com>
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+package org.mozilla.gecko;
+
+import org.json.JSONObject;
+
+public interface GeckoEventListener {
+    public void handleMessage(String event, JSONObject message);
+}
diff --git a/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/BufferedCairoImage.java b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/BufferedCairoImage.java
new file mode 100644
index 000000000000..b6c397767619
--- /dev/null
+++ b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/BufferedCairoImage.java
@@ -0,0 +1,105 @@
+/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
+ * ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Mozilla Android code.
+ *
+ * The Initial Developer of the Original Code is Mozilla Foundation.
+ * Portions created by the Initial Developer are Copyright (C) 2009-2010
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Patrick Walton <pcwalton@mozilla.com>
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+package org.mozilla.gecko.gfx;
+
+import android.graphics.Bitmap;
+
+import org.libreoffice.LOKitShell;
+
+import java.nio.ByteBuffer;
+
+//import org.mozilla.gecko.GeckoAppShell;
+
+/**
+ * A Cairo image that simply saves a buffer of pixel data.
+ */
+public class BufferedCairoImage extends CairoImage {
+    private ByteBuffer mBuffer;
+    private IntSize mSize;
+    private int mFormat;
+    private boolean mNeedToFreeBuffer = false;
+
+    /**
+     * Creates a buffered Cairo image from a byte buffer.
+     */
+    public BufferedCairoImage(ByteBuffer inBuffer, int inWidth, int inHeight, int inFormat) {
+        mBuffer = inBuffer;
+        mSize = new IntSize(inWidth, inHeight);
+        mFormat = inFormat;
+    }
+
+    /**
+     * Creates a buffered Cairo image from an Android bitmap.
+     */
+    public BufferedCairoImage(Bitmap bitmap) {
+        mFormat = CairoUtils.bitmapConfigToCairoFormat(bitmap.getConfig());
+        mSize = new IntSize(bitmap.getWidth(), bitmap.getHeight());
+        mNeedToFreeBuffer = true;
+        // XXX Why is this * 4? Shouldn't it depend on mFormat?
+        mBuffer = /*GeckoAppShell*/LOKitShell.allocateDirectBuffer(mSize.getArea() * 4);
+
+        bitmap.copyPixelsToBuffer(mBuffer.asIntBuffer());
+    }
+
+    protected void finalize() throws Throwable {
+        try {
+            if (mNeedToFreeBuffer && mBuffer != null)
+                /*GeckoAppShell*/ LOKitShell.freeDirectBuffer(mBuffer);
+            mNeedToFreeBuffer = false;
+            mBuffer = null;
+        } finally {
+            super.finalize();
+        }
+    }
+
+    @Override
+    public ByteBuffer getBuffer() {
+        return mBuffer;
+    }
+
+    @Override
+    public IntSize getSize() {
+        return mSize;
+    }
+
+    @Override
+    public int getFormat() {
+        return mFormat;
+    }
+}
+
diff --git a/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/CairoGLInfo.java b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/CairoGLInfo.java
new file mode 100644
index 000000000000..bd4eedcaf951
--- /dev/null
+++ b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/CairoGLInfo.java
@@ -0,0 +1,72 @@
+/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
+ * ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Mozilla Android code.
+ *
+ * The Initial Developer of the Original Code is Mozilla Foundation.
+ * Portions created by the Initial Developer are Copyright (C) 2009-2010
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Patrick Walton <pcwalton@mozilla.com>
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+package org.mozilla.gecko.gfx;
+
+import javax.microedition.khronos.opengles.GL10;
+
+/**
+ * Information needed to render Cairo bitmaps using OpenGL ES.
+ */
+public class CairoGLInfo {
+    public final int internalFormat;
+    public final int format;
+    public final int type;
+
+    public CairoGLInfo(int cairoFormat) {
+        switch (cairoFormat) {
+            case CairoImage.FORMAT_ARGB32:
+                internalFormat = format = GL10.GL_RGBA;
+                type = GL10.GL_UNSIGNED_BYTE;
+                break;
+            case CairoImage.FORMAT_RGB24:
+                internalFormat = format = GL10.GL_RGB;
+                type = GL10.GL_UNSIGNED_BYTE;
+                break;
+            case CairoImage.FORMAT_RGB16_565:
+                internalFormat = format = GL10.GL_RGB;
+                type = GL10.GL_UNSIGNED_SHORT_5_6_5;
+                break;
+            case CairoImage.FORMAT_A8:
+            case CairoImage.FORMAT_A1:
+                throw new RuntimeException("Cairo FORMAT_A1 and FORMAT_A8 unsupported");
+            default:
+                throw new RuntimeException("Unknown Cairo format");
+        }
+    }
+}
+
diff --git a/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/CairoImage.java b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/CairoImage.java
new file mode 100644
index 000000000000..06c389dd0524
--- /dev/null
+++ b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/CairoImage.java
@@ -0,0 +1,58 @@
+/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
+ * ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Mozilla Android code.
+ *
+ * The Initial Developer of the Original Code is Mozilla Foundation.
+ * Portions created by the Initial Developer are Copyright (C) 2009-2010
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Patrick Walton <pcwalton@mozilla.com>
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+package org.mozilla.gecko.gfx;
+
+import java.nio.ByteBuffer;
+
+/*
+ * A bitmap with pixel data in one of the formats that Cairo understands.
+ */
+public abstract class CairoImage {
+    public abstract ByteBuffer getBuffer();
+
+    public abstract IntSize getSize();
+    public abstract int getFormat();
+
+    public static final int FORMAT_INVALID = -1;
+    public static final int FORMAT_ARGB32 = 0;
+    public static final int FORMAT_RGB24 = 1;
+    public static final int FORMAT_A8 = 2;
+    public static final int FORMAT_A1 = 3;
+    public static final int FORMAT_RGB16_565 = 4;
+}
+
diff --git a/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/CairoUtils.java b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/CairoUtils.java
new file mode 100644
index 000000000000..00bd896e1664
--- /dev/null
+++ b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/CairoUtils.java
@@ -0,0 +1,85 @@
+/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
+ * ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Mozilla Android code.
+ *
+ * The Initial Developer of the Original Code is Mozilla Foundation.
+ * Portions created by the Initial Developer are Copyright (C) 2009-2010
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Patrick Walton <pcwalton@mozilla.com>
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+package org.mozilla.gecko.gfx;
+
+import org.mozilla.gecko.gfx.CairoImage;
+import android.graphics.Bitmap;
+import javax.microedition.khronos.opengles.GL10;
+
+/**
+ * Utility methods useful when displaying Cairo bitmaps using OpenGL ES.
+ */
+public class CairoUtils {
+    private CairoUtils() { /* Don't call me. */ }
+
+    public static int bitsPerPixelForCairoFormat(int cairoFormat) {
+        switch (cairoFormat) {
+        case CairoImage.FORMAT_A1:          return 1;
+        case CairoImage.FORMAT_A8:          return 8;
+        case CairoImage.FORMAT_RGB16_565:   return 16;
+        case CairoImage.FORMAT_RGB24:       return 24;
+        case CairoImage.FORMAT_ARGB32:      return 32;
+        default:
+            throw new RuntimeException("Unknown Cairo format");
+        }
+    }
+
+    public static int bitmapConfigToCairoFormat(Bitmap.Config config) {
+        if (config == null)
+            return CairoImage.FORMAT_ARGB32;    /* Droid Pro fix. */
+
+        switch (config) {
+        case ALPHA_8:   return CairoImage.FORMAT_A8;
+        case ARGB_4444: throw new RuntimeException("ARGB_444 unsupported");
+        case ARGB_8888: return CairoImage.FORMAT_ARGB32;
+        case RGB_565:   return CairoImage.FORMAT_RGB16_565;
+        default:        throw new RuntimeException("Unknown Skia bitmap config");
+        }
+    }
+
+    public static Bitmap.Config cairoFormatTobitmapConfig(int format) {
+        switch (format) {
+        case CairoImage.FORMAT_A8:        return Bitmap.Config.ALPHA_8;
+        case CairoImage.FORMAT_ARGB32:    return Bitmap.Config.ARGB_8888;
+        case CairoImage.FORMAT_RGB16_565: return Bitmap.Config.RGB_565;
+        default:
+            throw new RuntimeException("Unknown CairoImage format");
+        }
+    }
+}
+
diff --git a/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/CheckerboardImage.java b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/CheckerboardImage.java
new file mode 100644
index 000000000000..392d7e8d8463
--- /dev/null
+++ b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/CheckerboardImage.java
@@ -0,0 +1,170 @@
+/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
+ * ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Mozilla Android code.
+ *
+ * The Initial Developer of the Original Code is Mozilla Foundation.
+ * Portions created by the Initial Developer are Copyright (C) 2012
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Patrick Walton <pcwalton@mozilla.com>
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+package org.mozilla.gecko.gfx;
+
+import org.libreoffice.LOKitShell;
+import android.graphics.Color;
+import java.nio.ByteBuffer;
+import java.nio.ShortBuffer;
+import java.util.Arrays;
+
+/** A Cairo image that displays a tinted checkerboard. */
+public class CheckerboardImage extends CairoImage {
+    // The width and height of the checkerboard tile.
+    private static final int SIZE = 16;
+    // The pixel format of the checkerboard tile.
+    private static final int FORMAT = CairoImage.FORMAT_RGB16_565;
+    // The color to mix in to tint the background color.
+    private static final int TINT_COLOR = Color.GRAY;
+    // The amount to mix in.
+    private static final float TINT_OPACITY = 0.4f;
+
+    private ByteBuffer mBuffer;
+    private int mMainColor;
+    private boolean mShowChecks;
+
+    /** Creates a new checkerboard image. */
+    public CheckerboardImage() {
+        int bpp = CairoUtils.bitsPerPixelForCairoFormat(FORMAT);
+        mBuffer = LOKitShell.allocateDirectBuffer(SIZE * SIZE * bpp / 8);
+        update(true, Color.WHITE);
+    }
+
+    /** Returns the current color of the checkerboard. */
+    public int getColor() {
+        return mMainColor;
+    }
+
+    /** Returns whether or not we are currently showing checks on the checkerboard. */
+    public boolean getShowChecks() {
+        return mShowChecks;
+    }
+
+    /** Updates the checkerboard image. If showChecks is true, then create a
+     checkerboard image that is tinted to the color. Otherwise just return a flat
+     image of the color. */
+    public void update(boolean showChecks, int color) {
+        mMainColor = color;
+        mShowChecks = showChecks;
+
+        short mainColor16 = convertTo16Bit(mMainColor);
+
+        mBuffer.rewind();
+        ShortBuffer shortBuffer = mBuffer.asShortBuffer();
+
+        if (!mShowChecks) {
+            short color16 = convertTo16Bit(mMainColor);
+            short[] fillBuffer = new short[SIZE];
+            Arrays.fill(fillBuffer, color16);
+
+            for (int i = 0; i < SIZE; i++) {
+                shortBuffer.put(fillBuffer);
+            }
+
+            return;
+        }
+
+        short tintColor16 = convertTo16Bit(tint(mMainColor));
+
+        short[] mainPattern = new short[SIZE / 2], tintPattern = new short[SIZE / 2];
+        Arrays.fill(mainPattern, mainColor16);
+        Arrays.fill(tintPattern, tintColor16);
+
+        // The checkerboard pattern looks like this:
+        //
+        // +---+---+
+        // | N | T |  N = normal
+        // +---+---+  T = tinted
+        // | T | N |
+        // +---+---+
+
+        for (int i = 0; i < SIZE / 2; i++) {
+            shortBuffer.put(mainPattern);
+            shortBuffer.put(tintPattern);
+        }
+        for (int i = SIZE / 2; i < SIZE; i++) {
+            shortBuffer.put(tintPattern);
+            shortBuffer.put(mainPattern);
+        }
+    }
+
+    // Tints the given color appropriately and returns the tinted color.
+    private int tint(int color) {
+        float negTintOpacity = 1.0f - TINT_OPACITY;
+        float r = Color.red(color) * negTintOpacity + Color.red(TINT_COLOR) * TINT_OPACITY;
+        float g = Color.green(color) * negTintOpacity + Color.green(TINT_COLOR) * TINT_OPACITY;
+        float b = Color.blue(color) * negTintOpacity + Color.blue(TINT_COLOR) * TINT_OPACITY;
+        return Color.rgb(Math.round(r), Math.round(g), Math.round(b));
+    }
+
+    // Converts a 32-bit ARGB color to 16-bit R5G6B5, truncating values and discarding the alpha
+    // channel.
+    private short convertTo16Bit(int color) {
+        int r = Color.red(color) >> 3, g = Color.green(color) >> 2, b = Color.blue(color) >> 3;
+        int c = ((r << 11) | (g << 5) | b);
+        // Swap endianness.
+        return (short)((c >> 8) | ((c & 0xff) << 8));
+    }
+
+    @Override
+    protected void finalize() throws Throwable {
+        try {
+            if (mBuffer != null) {
+                LOKitShell.freeDirectBuffer(mBuffer);
+            }
+        } finally {
+            super.finalize();
+        }
+    }
+
+    @Override
+    public ByteBuffer getBuffer() {
+        return mBuffer;
+    }
+
+    @Override
+    public IntSize getSize() {
+        return new IntSize(SIZE, SIZE);
+    }
+
+    @Override
+    public int getFormat() {
+        return FORMAT;
+    }
+}
+
diff --git a/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/FlexibleGLSurfaceView.java b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/FlexibleGLSurfaceView.java
new file mode 100644
index 000000000000..dc20077b0457
--- /dev/null
+++ b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/FlexibleGLSurfaceView.java
@@ -0,0 +1,218 @@
+/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
+ * ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Mozilla Android code.
+ *
+ * The Initial Developer of the Original Code is Mozilla Foundation.
+ * Portions created by the Initial Developer are Copyright (C) 2011-2012
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Patrick Walton <pcwalton@mozilla.com>
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+package org.mozilla.gecko.gfx;
+
+//import org.mozilla.gecko.GeckoApp;
+import android.content.Context;
+import android.graphics.PixelFormat;
+import android.opengl.GLSurfaceView;
+import android.util.AttributeSet;
+import android.util.Log;
+import android.view.SurfaceHolder;
+import android.view.SurfaceView;
+
+import org.libreoffice.LibreOfficeMainActivity;
+
+public class FlexibleGLSurfaceView extends SurfaceView implements SurfaceHolder.Callback {
+    private static final String LOGTAG = "GeckoFlexibleGLSurfaceView";
+
+    private GLSurfaceView.Renderer mRenderer;
+    private GLThread mGLThread; // Protected by this class's monitor.
+    private GLController mController;
+    private Listener mListener;
+
+    public FlexibleGLSurfaceView(Context context) {
+        super(context);
+        init();
+    }
+
+    public FlexibleGLSurfaceView(Context context, AttributeSet attributeSet) {
+        super(context, attributeSet);
+        init();
+    }
+
+    public void init() {
+        SurfaceHolder holder = getHolder();
+        holder.addCallback(this);
+        holder.setFormat(PixelFormat.RGB_565);
+
+        mController = new GLController(this);
+    }
+
+    public void setRenderer(GLSurfaceView.Renderer renderer) {
+        mRenderer = renderer;
+    }
+
+    public GLSurfaceView.Renderer getRenderer() {
+        return mRenderer;
+    }
+
+    public void setListener(Listener listener) {
+        mListener = listener;
+    }
+
+    public synchronized void requestRender() {
+        if (mGLThread != null) {
+            mGLThread.renderFrame();
+        }
+        if (mListener != null) {
+            mListener.renderRequested();
+        }
+    }
+
+    /**
+     * Creates a Java GL thread. After this is called, the FlexibleGLSurfaceView may be used just
+     * like a GLSurfaceView. It is illegal to access the controller after this has been called.
+     */
+    public synchronized void createGLThread() {
+        if (mGLThread != null) {
+            throw new FlexibleGLSurfaceViewException("createGLThread() called with a GL thread " +
+                    "already in place!");
+        }
+
+        Log.e(LOGTAG, "### Creating GL thread!");
+        mGLThread = new GLThread(mController);
+        mGLThread.start();
+        notifyAll();
+    }
+
+    /**
+     * Destroys the Java GL thread. Returns a Thread that completes when the Java GL thread is
+     * fully shut down.
+     */
+    public synchronized Thread destroyGLThread() {
+        // Wait for the GL thread to be started.
+        Log.e(LOGTAG, "### Waiting for GL thread to be created...");
+        while (mGLThread == null) {
+            try {
+                wait();
+            } catch (InterruptedException e) {
+                throw new RuntimeException(e);
+            }
+        }
+
+        Log.e(LOGTAG, "### Destroying GL thread!");
+        Thread glThread = mGLThread;
+        mGLThread.shutdown();
+        mGLThread = null;
+        return glThread;
+    }
+
+    public synchronized void recreateSurface() {
+        if (mGLThread == null) {
+            throw new FlexibleGLSurfaceViewException("recreateSurface() called with no GL " +
+                    "thread active!");
+        }
+
+        mGLThread.recreateSurface();
+    }
+
+    public synchronized GLController getGLController() {
+        if (mGLThread != null) {
+            throw new FlexibleGLSurfaceViewException("getGLController() called with a GL thread " +
+                    "active; shut down the GL thread first!");
+        }
+
+        return mController;
+    }
+
+    public synchronized void surfaceChanged(SurfaceHolder holder, int format, int width,
+                                            int height) {
+        mController.sizeChanged(width, height);
+        if (mGLThread != null) {
+            mGLThread.surfaceChanged(width, height);
+        }
+
+        if (mListener != null) {
+            mListener.surfaceChanged(width, height);
+        }
+    }
+
+    public synchronized void surfaceCreated(SurfaceHolder holder) {
+        mController.surfaceCreated();
+        if (mGLThread != null) {
+            mGLThread.surfaceCreated();
+        }
+    }
+
+    public synchronized void surfaceDestroyed(SurfaceHolder holder) {
+        mController.surfaceDestroyed();
+        if (mGLThread != null) {
+            mGLThread.surfaceDestroyed();
+        }
+
+        if (mListener != null) {
+            mListener.compositionPauseRequested();
+        }
+    }
+
+    // Called from the compositor thread
+    public static GLController registerCxxCompositor() {
+        try {
+            Log.e(LOGTAG, "### registerCxxCompositor point A");
+            System.out.println("register layer comp");
+            Log.e(LOGTAG, "### registerCxxCompositor point B");
+            FlexibleGLSurfaceView flexView = (FlexibleGLSurfaceView) /*GeckoApp*/LibreOfficeMainActivity.mAppContext.getLayerController().getView();
+            Log.e(LOGTAG, "### registerCxxCompositor point C: " + flexView);
+            try {
+                flexView.destroyGLThread().join();
+            } catch (InterruptedException e) {}
+            Log.e(LOGTAG, "### registerCxxCompositor point D: " + flexView.getGLController());
+            return flexView.getGLController();
+        } catch (Exception e) {
+            Log.e(LOGTAG, "### Exception! " + e);
+            return null;
+        }
+    }
+
+    public interface Listener {
+        void renderRequested();
+        void compositionPauseRequested();
+        void compositionResumeRequested();
+        void surfaceChanged(int width, int height);
+    }
+
+    public static class FlexibleGLSurfaceViewException extends RuntimeException {
+        public static final long serialVersionUID = 1L;
+
+        FlexibleGLSurfaceViewException(String e) {
+            super(e);
+        }
+    }
+}
+
diff --git a/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/FloatSize.java b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/FloatSize.java
new file mode 100644
index 000000000000..5fb73ec18df9
--- /dev/null
+++ b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/FloatSize.java
@@ -0,0 +1,99 @@
+/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
+ * ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Mozilla Android code.
+ *
+ * The Initial Developer of the Original Code is Mozilla Foundation.
+ * Portions created by the Initial Developer are Copyright (C) 2009-2010
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Patrick Walton <pcwalton@mozilla.com>
+ *   Chris Lord <chrislord.net@gmail.com>
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+package org.mozilla.gecko.gfx;
+
+import org.json.JSONException;
+import org.json.JSONObject;
+import org.mozilla.gecko.util.FloatUtils;
+
+public class FloatSize {
+    public final float width, height;
+
+    public FloatSize(FloatSize size) {
+        width = size.width;
+        height = size.height;
+    }
+
+    public FloatSize(IntSize size) {
+        width = size.width;
+        height = size.height;
+    }
+
+    public FloatSize(float aWidth, float aHeight) {
+        width = aWidth;
+        height = aHeight;
+    }
+
+    public FloatSize(JSONObject json) {
+        try {
+            width = (float) json.getDouble("width");
+            height = (float) json.getDouble("height");
+        } catch (JSONException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    @Override
+    public String toString() {
+        return "(" + width + "," + height + ")";
+    }
+
+    public boolean isPositive() {
+        return (width > 0 && height > 0);
+    }
+
+    public boolean fuzzyEquals(FloatSize size) {
+        return (FloatUtils.fuzzyEquals(size.width, width) &&
+                FloatUtils.fuzzyEquals(size.height, height));
+    }
+
+    public FloatSize scale(float factor) {
+        return new FloatSize(width * factor, height * factor);
+    }
+
+    /*
+     * Returns the size that represents a linear transition between this size and `to` at time `t`,
+     * which is on the scale [0, 1).
+     */
+    public FloatSize interpolate(FloatSize to, float t) {
+        return new FloatSize(FloatUtils.interpolate(width, to.width, t),
+                FloatUtils.interpolate(height, to.height, t));
+    }
+}
+
diff --git a/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/GLController.java b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/GLController.java
new file mode 100644
index 000000000000..e8f201228666
--- /dev/null
+++ b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/GLController.java
@@ -0,0 +1,279 @@
+/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
+ * ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Mozilla Android code.
+ *
+ * The Initial Developer of the Original Code is Mozilla Foundation.
+ * Portions created by the Initial Developer are Copyright (C) 2011-2012
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Patrick Walton <pcwalton@mozilla.com>
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+package org.mozilla.gecko.gfx;
+
+import android.util.Log;
+import android.view.SurfaceHolder;
+import android.view.SurfaceView;
+import javax.microedition.khronos.egl.EGL10;
+import javax.microedition.khronos.egl.EGL11;
+import javax.microedition.khronos.egl.EGLConfig;
+import javax.microedition.khronos.egl.EGLContext;
+import javax.microedition.khronos.egl.EGLDisplay;
+import javax.microedition.khronos.egl.EGLSurface;
+import javax.microedition.khronos.opengles.GL;
+import javax.microedition.khronos.opengles.GL10;
+
+public class GLController {
+    private static final int EGL_CONTEXT_CLIENT_VERSION = 0x3098;
+    private static final String LOGTAG = "GeckoGLController";
+
+    private FlexibleGLSurfaceView mView;
+    private int mGLVersion;
+    private boolean mSurfaceValid;
+    private int mWidth, mHeight;
+
+    private EGL10 mEGL;
+    private EGLDisplay mEGLDisplay;
+    private EGLConfig mEGLConfig;
+    private EGLContext mEGLContext;
+    private EGLSurface mEGLSurface;
+
+    private GL mGL;
+
+    private static final int LOCAL_EGL_OPENGL_ES2_BIT = 4;
+
+    private static final int[] CONFIG_SPEC = {
+            EGL10.EGL_RED_SIZE, 5,
+            EGL10.EGL_GREEN_SIZE, 6,
+            EGL10.EGL_BLUE_SIZE, 5,
+            EGL10.EGL_SURFACE_TYPE, EGL10.EGL_WINDOW_BIT,
+            EGL10.EGL_RENDERABLE_TYPE, LOCAL_EGL_OPENGL_ES2_BIT,
+            EGL10.EGL_NONE
+    };
+
+    public GLController(FlexibleGLSurfaceView view) {
+        mView = view;
+        mGLVersion = 2;
+        mSurfaceValid = false;
+    }
+
+    public void setGLVersion(int version) {
+        mGLVersion = version;
+    }
+
+    /** You must call this on the same thread you intend to use OpenGL on. */
+    public void initGLContext() {
+        initEGLContext();
+        createEGLSurface();
+    }
+
+    public void disposeGLContext() {
+        if (!mEGL.eglMakeCurrent(mEGLDisplay, EGL10.EGL_NO_SURFACE, EGL10.EGL_NO_SURFACE,
+                EGL10.EGL_NO_CONTEXT)) {
+            throw new GLControllerException("EGL context could not be released!");
+        }
+
+        if (mEGLSurface != null) {
+            if (!mEGL.eglDestroySurface(mEGLDisplay, mEGLSurface)) {
+                throw new GLControllerException("EGL surface could not be destroyed!");
+            }
+
+            mEGLSurface = null;
+        }
+
+        if (mEGLContext == null) {
+            if (!mEGL.eglDestroyContext(mEGLDisplay, mEGLContext)) {
+                throw new GLControllerException("EGL context could not be destroyed!");
+            }
+
+            mGL = null;
+            mEGLDisplay = null;
+            mEGLConfig = null;
+            mEGLContext = null;
+        }
+    }
+
+    public GL getGL()                       { return mEGLContext.getGL(); }
+    public EGLDisplay getEGLDisplay()       { return mEGLDisplay;         }
+    public EGLConfig getEGLConfig()         { return mEGLConfig;          }
+    public EGLContext getEGLContext()       { return mEGLContext;         }
+    public EGLSurface getEGLSurface()       { return mEGLSurface;         }
+    public FlexibleGLSurfaceView getView()  { return mView;               }
+
+    public boolean hasSurface() {
+        return mEGLSurface != null;
+    }
+
+    public boolean swapBuffers() {
+        return mEGL.eglSwapBuffers(mEGLDisplay, mEGLSurface);
+    }
+
+    public boolean checkForLostContext() {
+        if (mEGL.eglGetError() != EGL11.EGL_CONTEXT_LOST) {
+            return false;
+        }
+
+        mEGLDisplay = null;
+        mEGLConfig = null;
+        mEGLContext = null;
+        mEGLSurface = null;
+        mGL = null;
+        return true;
+    }
+
+    public synchronized void waitForValidSurface() {
+        while (!mSurfaceValid) {
+            try {
+                wait();
+            } catch (InterruptedException e) {
+                throw new RuntimeException(e);
+            }
+        }
+    }
+
+    public synchronized int getWidth() {
+        return mWidth;
+    }
+
+    public synchronized int getHeight() {
+        return mHeight;
+    }
+
+    synchronized void surfaceCreated() {
+        mSurfaceValid = true;
+        notifyAll();
+    }
+
+    synchronized void surfaceDestroyed() {
+        mSurfaceValid = false;
+        notifyAll();
+    }
+
+    synchronized void sizeChanged(int newWidth, int newHeight) {
+        mWidth = newWidth;
+        mHeight = newHeight;
+    }
+
+    private void initEGL() {
+        mEGL = (EGL10)EGLContext.getEGL();
+
+        mEGLDisplay = mEGL.eglGetDisplay(EGL10.EGL_DEFAULT_DISPLAY);
+        if (mEGLDisplay == EGL10.EGL_NO_DISPLAY) {
+            throw new GLControllerException("eglGetDisplay() failed");
+        }
+
+        int[] version = new int[2];
+        if (!mEGL.eglInitialize(mEGLDisplay, version)) {
+            throw new GLControllerException("eglInitialize() failed");
+        }
+
+        mEGLConfig = chooseConfig();
+    }
+
+    private void initEGLContext() {
+        initEGL();
+
+        int[] attribList = { EGL_CONTEXT_CLIENT_VERSION, mGLVersion, EGL10.EGL_NONE };
+        mEGLContext = mEGL.eglCreateContext(mEGLDisplay, mEGLConfig, EGL10.EGL_NO_CONTEXT,
+                attribList);
+        if (mEGLContext == null || mEGLContext == EGL10.EGL_NO_CONTEXT) {
+            throw new GLControllerException("createContext() failed");
+        }
+    }
+
+    private EGLConfig chooseConfig() {
+        int[] numConfigs = new int[1];
+        if (!mEGL.eglChooseConfig(mEGLDisplay, CONFIG_SPEC, null, 0, numConfigs) ||
+                numConfigs[0] <= 0) {
+            throw new GLControllerException("No available EGL configurations");
+        }
+
+        EGLConfig[] configs = new EGLConfig[numConfigs[0]];
+        if (!mEGL.eglChooseConfig(mEGLDisplay, CONFIG_SPEC, configs, numConfigs[0], numConfigs)) {
+            throw new GLControllerException("No EGL configuration for that specification");
+        }
+
+        // Select the first 565 RGB configuration.
+        int[] red = new int[1], green = new int[1], blue = new int[1];
+        for (EGLConfig config : configs) {
+            mEGL.eglGetConfigAttrib(mEGLDisplay, config, EGL10.EGL_RED_SIZE, red);
+            mEGL.eglGetConfigAttrib(mEGLDisplay, config, EGL10.EGL_GREEN_SIZE, green);
+            mEGL.eglGetConfigAttrib(mEGLDisplay, config, EGL10.EGL_BLUE_SIZE, blue);
+            if (red[0] == 5 && green[0] == 6 && blue[0] == 5) {
+                return config;
+            }
+        }
+
+        throw new GLControllerException("No suitable EGL configuration found");
+    }
+
+    private void createEGLSurface() {
+        SurfaceHolder surfaceHolder = mView.getHolder();
+        mEGLSurface = mEGL.eglCreateWindowSurface(mEGLDisplay, mEGLConfig, surfaceHolder, null);
+        if (mEGLSurface == null || mEGLSurface == EGL10.EGL_NO_SURFACE) {
+            throw new GLControllerException("EGL window surface could not be created!");
+        }
+
+        if (!mEGL.eglMakeCurrent(mEGLDisplay, mEGLSurface, mEGLSurface, mEGLContext)) {
+            throw new GLControllerException("EGL surface could not be made into the current " +
+                    "surface!");
+        }
+
+        mGL = mEGLContext.getGL();
+
+        if (mView.getRenderer() != null) {
+            mView.getRenderer().onSurfaceCreated((GL10)mGL, mEGLConfig);
+            mView.getRenderer().onSurfaceChanged((GL10)mGL, mView.getWidth(), mView.getHeight());
+        }
+    }
+
+    // Provides an EGLSurface without assuming ownership of this surface.
+    private EGLSurface provideEGLSurface() {
+        if (mEGL == null) {
+            initEGL();
+        }
+
+        SurfaceHolder surfaceHolder = mView.getHolder();
+        mEGLSurface = mEGL.eglCreateWindowSurface(mEGLDisplay, mEGLConfig, surfaceHolder, null);
+        if (mEGLSurface == null || mEGLSurface == EGL10.EGL_NO_SURFACE) {
+            throw new GLControllerException("EGL window surface could not be created!");
+        }
+
+        return mEGLSurface;
+    }
+
+    public static class GLControllerException extends RuntimeException {
+        public static final long serialVersionUID = 1L;
+
+        GLControllerException(String e) {
+            super(e);
+        }
+    }
+}
+
diff --git a/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/GLThread.java b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/GLThread.java
new file mode 100644
index 000000000000..4f788f64ebcb
--- /dev/null
+++ b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/GLThread.java
@@ -0,0 +1,181 @@
+/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
+ * ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Mozilla Android code.
+ *
+ * The Initial Developer of the Original Code is Mozilla Foundation.
+ * Portions created by the Initial Developer are Copyright (C) 2011-2012
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Patrick Walton <pcwalton@mozilla.com>
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+package org.mozilla.gecko.gfx;
+
+import android.opengl.GLSurfaceView;
+import android.view.SurfaceHolder;
+import javax.microedition.khronos.opengles.GL10;
+import java.util.concurrent.Future;
+import java.util.concurrent.LinkedBlockingQueue;
+
+// A GL thread managed by Java. It is not necessary to use this class to use the
+// FlexibleGLSurfaceView, but it can be helpful, especially if the GL rendering is to be done
+// entirely in Java.
+class GLThread extends Thread {
+    private LinkedBlockingQueue<Runnable> mQueue;
+    private GLController mController;
+    private boolean mRenderQueued;
+
+    public GLThread(GLController controller) {
+        mQueue = new LinkedBlockingQueue<Runnable>();
+        mController = controller;
+    }
+
+    @Override
+    public void run() {
+        while (true) {
+            Runnable runnable;
+            try {
+                runnable = mQueue.take();
+            } catch (InterruptedException e) {
+                throw new RuntimeException(e);
+            }
+
+            runnable.run();
+            if (runnable instanceof ShutdownMessage) {
+                break;
+            }
+        }
+    }
+
+    public void recreateSurface() {
+        mQueue.add(new RecreateSurfaceMessage());
+    }
+
+    public void renderFrame() {
+        // Make sure there's only one render event in the queue at a time.
+        synchronized (this) {
+            if (!mRenderQueued) {
+                mQueue.add(new RenderFrameMessage());
+                mRenderQueued = true;
+            }
+        }
+    }
+
+    public void shutdown() {
+        mQueue.add(new ShutdownMessage());
+    }
+
+    public void surfaceChanged(int width, int height) {
+        mQueue.add(new SizeChangedMessage(width, height));
+    }
+
+    public void surfaceCreated() {
+        mQueue.add(new SurfaceCreatedMessage());
+    }
+
+    public void surfaceDestroyed() {
+        mQueue.add(new SurfaceDestroyedMessage());
+    }
+
+    private void doRecreateSurface() {
+        mController.disposeGLContext();
+        mController.initGLContext();
+    }
+
+    private GLSurfaceView.Renderer getRenderer() {
+        return mController.getView().getRenderer();
+    }
+
+    private class RecreateSurfaceMessage implements Runnable {
+        public void run() {
+            doRecreateSurface();
+        }
+    }
+
+    private class RenderFrameMessage implements Runnable {
+        public void run() {
+            synchronized (GLThread.this) {
+                mRenderQueued = false;
+            }
+
+            // Bail out if the surface was lost.
+            if (mController.getEGLSurface() == null) {
+                return;
+            }
+
+            GLSurfaceView.Renderer renderer = getRenderer();
+            if (renderer != null) {
+                renderer.onDrawFrame((GL10)mController.getGL());
+            }
+
+            mController.swapBuffers();
+            //if (!mController.swapBuffers() && mController.checkForLostContext()) {
+            //    doRecreateSurface();
+            //}
+        }
+    }
+
+    private class ShutdownMessage implements Runnable {
+        public void run() {
+            mController.disposeGLContext();
+            mController = null;
+        }
+    }
+
+    private class SizeChangedMessage implements Runnable {
+        private int mWidth, mHeight;
+
+        public SizeChangedMessage(int width, int height) {
+            mWidth = width;
+            mHeight = height;
+        }
+
+        public void run() {
+            GLSurfaceView.Renderer renderer = getRenderer();
+            if (renderer != null) {
+                renderer.onSurfaceChanged((GL10)mController.getGL(), mWidth, mHeight);
+            }
+        }
+    }
+
+    private class SurfaceCreatedMessage implements Runnable {
+        public void run() {
+            if (!mController.hasSurface()) {
+                mController.initGLContext();
+            }
+        }
+    }
+
+    private class SurfaceDestroyedMessage implements Runnable {
+        public void run() {
+            mController.disposeGLContext();
+        }
+    }
+}
+
diff --git a/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/GeckoGLLayerClient.java b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/GeckoGLLayerClient.java
new file mode 100644
index 000000000000..9e4f376e7ad2
--- /dev/null
+++ b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/GeckoGLLayerClient.java
@@ -0,0 +1,265 @@
+/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
+ * ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Mozilla Android code.
+ *
+ * The Initial Developer of the Original Code is Mozilla Foundation.
+ * Portions created by the Initial Developer are Copyright (C) 2009-2010
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Patrick Walton <pcwalton@mozilla.com>
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+package org.mozilla.gecko.gfx;
+
+
+import android.content.Context;
+import android.graphics.Bitmap;
+import android.graphics.Point;
+import android.graphics.PointF;
+import android.graphics.Rect;
+import android.util.Log;
+import android.view.View;
+
+import org.libreoffice.LOEvent;
+import org.libreoffice.LOKitShell;
+
+public class GeckoGLLayerClient extends GeckoLayerClient
+        implements FlexibleGLSurfaceView.Listener, VirtualLayer.Listener {
+    private static final String LOGTAG = "GeckoGLLayerClient";
+
+    private LayerRenderer mLayerRenderer;
+    private boolean mLayerRendererInitialized;
+
+    public GeckoGLLayerClient(Context context) {
+        super(context);
+    }
+
+    @Override
+    public Rect beginDrawing(int width, int height, int tileWidth, int tileHeight,
+                             String metadata, boolean hasDirectTexture) {
+        Rect bufferRect = super.beginDrawing(width, height, tileWidth, tileHeight,
+                metadata, hasDirectTexture);
+        if (bufferRect == null) {
+            return null;
+        }
+
+        // Be sure to adjust the buffer size; if it's not at least as large as the viewport size,
+        // ViewportMetrics.getOptimumViewportOffset() gets awfully confused and severe display
+        // corruption results!
+        if (mBufferSize.width != width || mBufferSize.height != height) {
+            mBufferSize = new IntSize(width, height);
+        }
+
+        return bufferRect;
+    }
+
+    @Override
+    protected boolean handleDirectTextureChange(boolean hasDirectTexture) {
+        Log.e(LOGTAG, "### handleDirectTextureChange");
+        if (mTileLayer != null) {
+            return false;
+        }
+
+        Log.e(LOGTAG, "### Creating virtual layer");
+        VirtualLayer virtualLayer = new VirtualLayer();
+        virtualLayer.setListener(this);
+        virtualLayer.setSize(getBufferSize());
+        getLayerController().setRoot(virtualLayer);
+        mTileLayer = virtualLayer;
+
+        sendResizeEventIfNecessary(true);
+        return true;
+    }
+
+    @Override
+    public void setLayerController(LayerController layerController) {
+        super.setLayerController(layerController);
+
+        LayerView view = layerController.getView();
+        view.setListener(this);
+
+        mLayerRenderer = new LayerRenderer(view);
+    }
+
+    @Override
+    protected boolean shouldDrawProceed(int tileWidth, int tileHeight) {
+        Log.e(LOGTAG, "### shouldDrawProceed");
+        // Always draw.
+        return true;
+    }
+
+    @Override
+    protected void updateLayerAfterDraw(Rect updatedRect) {
+        Log.e(LOGTAG, "### updateLayerAfterDraw");
+        // Nothing to do.
+    }
+
+    @Override
+    protected IntSize getBufferSize() {
+        View view = (View) getLayerController().getView();
+        IntSize size = new IntSize(view.getWidth(), view.getHeight());
+        Log.e(LOGTAG, "### getBufferSize " + size);
+        return size;
+    }
+
+    @Override
+    protected IntSize getTileSize() {
+        Log.e(LOGTAG, "### getTileSize " + getBufferSize());
+        return getBufferSize();
+    }
+
+    @Override
+    protected void tileLayerUpdated() {
+        // Set the new origin and resolution instantly.
+        mTileLayer.performUpdates(null);
+    }
+
+    @Override
+    public Bitmap getBitmap() {
+        Log.e(LOGTAG, "### getBitmap");
+        IntSize size = getBufferSize();
+        try {
+            return Bitmap.createBitmap(size.width, size.height, Bitmap.Config.RGB_565);
+        } catch (OutOfMemoryError oom) {
+            Log.e(LOGTAG, "Unable to create bitmap", oom);
+            return null;
+        }
+    }
+
+    @Override
+    public int getType() {
+        Log.e(LOGTAG, "### getType");
+        return LAYER_CLIENT_TYPE_GL;
+    }
+
+    public void dimensionsChanged(Point newOrigin, float newResolution) {
+        Log.e(LOGTAG, "### dimensionsChanged " + newOrigin + " " + newResolution);
+    }
+
+    /* Informs Gecko that the screen size has changed. */
+    @Override
+    protected void sendResizeEventIfNecessary(boolean force) {
+        Log.e(LOGTAG, "### sendResizeEventIfNecessary " + force);
+
+        IntSize newSize = getBufferSize();
+        if (!force && mScreenSize != null && mScreenSize.equals(newSize)) {
+            return;
+        }
+
+        mScreenSize = newSize;
+
+        Log.e(LOGTAG, "### Screen-size changed to " + mScreenSize);
+        //GeckoEvent event = GeckoEvent.createSizeChangedEvent(mScreenSize.width, mScreenSize.height,
+        //        mScreenSize.width, mScreenSize.height,
+        //        mScreenSize.width, mScreenSize.height);
+        //GeckoAppShell.sendEventToGecko(event);
+        LOEvent event = LOEvent.sizeChanged(mScreenSize.width, mScreenSize.height,
+                                            mScreenSize.width, mScreenSize.height,
+                                            mScreenSize.width, mScreenSize.height);
+        LOKitShell.sendEvent(event);
+
+    }
+
+    /**
+     * For Gecko to use.
+     */
+    public ViewTransform getViewTransform() {
+        Log.e(LOGTAG, "### getViewTransform()");
+
+        // NB: We don't begin a transaction here because this can be called in a synchronous
+        // manner between beginDrawing() and endDrawing(), and that will cause a deadlock.
+
+        LayerController layerController = getLayerController();
+        synchronized (layerController) {
+            ViewportMetrics viewportMetrics = layerController.getViewportMetrics();
+            PointF viewportOrigin = viewportMetrics.getOrigin();
+            Point tileOrigin = mTileLayer.getOrigin();
+            float scrollX = viewportOrigin.x;
+            float scrollY = viewportOrigin.y;
+            float zoomFactor = viewportMetrics.getZoomFactor();
+            Log.e(LOGTAG, "### Viewport metrics = " + viewportMetrics + " tile reso = " +
+                    mTileLayer.getResolution());
+            return new ViewTransform(scrollX, scrollY, zoomFactor);
+        }
+    }
+
+    public void renderRequested() {
+        Log.e(LOGTAG, "### Render requested, scheduling composite");
+        LOKitShell.scheduleComposite();
+    }
+
+    public void compositionPauseRequested() {
+        Log.e(LOGTAG, "### Scheduling PauseComposition");
+        LOKitShell.schedulePauseComposition();
+    }
+
+    public void compositionResumeRequested() {
+        Log.e(LOGTAG, "### Scheduling ResumeComposition");
+        LOKitShell.scheduleResumeComposition();
+    }
+
+    public void surfaceChanged(int width, int height) {
+        compositionPauseRequested();
+        LayerController layerController = getLayerController();
+        layerController.setViewportSize(new FloatSize(width, height));
+        compositionResumeRequested();
+        renderRequested();
+    }
+
+    /**
+     * For Gecko to use.
+     */
+    public LayerRenderer.Frame createFrame() {
+        // Create the shaders and textures if necessary.
+        if (!mLayerRendererInitialized) {
+            mLayerRenderer.createProgram();
+            mLayerRendererInitialized = true;
+        }
+
+        // Build the contexts and create the frame.
+        Layer.RenderContext pageContext = mLayerRenderer.createPageContext();
+        Layer.RenderContext screenContext = mLayerRenderer.createScreenContext();
+        return mLayerRenderer.createFrame(pageContext, screenContext);
+    }
+
+    /**
+     * For Gecko to use.
+     */
+    public void activateProgram() {
+        mLayerRenderer.activateProgram();
+    }
+
+    /**
+     * For Gecko to use.
+     */
+    public void deactivateProgram() {
+        mLayerRenderer.deactivateProgram();
+    }
+}
+
diff --git a/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/GeckoLayerClient.java b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/GeckoLayerClient.java
new file mode 100644
index 000000000000..09349b4eea07
--- /dev/null
+++ b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/GeckoLayerClient.java
@@ -0,0 +1,414 @@
+/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
+ * ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Mozilla Android code.
+ *
+ * The Initial Developer of the Original Code is Mozilla Foundation.
+ * Portions created by the Initial Developer are Copyright (C) 2009-2010
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Patrick Walton <pcwalton@mozilla.com>
+ *   Chris Lord <chrislord.net@gmail.com>
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+package org.mozilla.gecko.gfx;
+
+import org.libreoffice.LOEvent;
+import org.libreoffice.LOKitShell;
+import org.libreoffice.LibreOfficeMainActivity;
+import org.mozilla.gecko.util.FloatUtils;
+//import org.mozilla.gecko.GeckoApp;
+//import org.mozilla.gecko.GeckoAppShell;
+//import org.mozilla.gecko.GeckoEvent;
+import org.mozilla.gecko.GeckoEventListener;
+import org.json.JSONException;
+import org.json.JSONObject;
+import android.content.Context;
+import android.graphics.Bitmap;
+import android.graphics.Color;
+import android.graphics.PointF;
+import android.graphics.Rect;
+import android.graphics.RectF;
+import android.os.SystemClock;
+import android.util.DisplayMetrics;
+import android.util.Log;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+public abstract class GeckoLayerClient extends LayerClient implements GeckoEventListener {
+    private static final String LOGTAG = "GeckoLayerClient";
+
+    public static final int LAYER_CLIENT_TYPE_NONE = 0;
+    public static final int LAYER_CLIENT_TYPE_SOFTWARE = 1;
+    public static final int LAYER_CLIENT_TYPE_GL = 2;
+
+    protected IntSize mScreenSize;
+    protected IntSize mBufferSize;
+
+    protected Layer mTileLayer;
+
+    /* The viewport that Gecko is currently displaying. */
+    protected ViewportMetrics mGeckoViewport;
+
+    /* The viewport that Gecko will display when drawing is finished */
+    protected ViewportMetrics mNewGeckoViewport;
+
+    private static final long MIN_VIEWPORT_CHANGE_DELAY = 25L;
+    private long mLastViewportChangeTime;
+    private boolean mPendingViewportAdjust;
+    private boolean mViewportSizeChanged;
+
+    // mUpdateViewportOnEndDraw is used to indicate that we received a
+    // viewport update notification while drawing. therefore, when the
+    // draw finishes, we need to update the entire viewport rather than
+    // just the page size. this boolean should always be accessed from
+    // inside a transaction, so no synchronization is needed.
+    private boolean mUpdateViewportOnEndDraw;
+
+    private String mLastCheckerboardColor;
+
+    private static Pattern sColorPattern;
+
+    /* Used by robocop for testing purposes */
+    private DrawListener mDrawListener;
+
+    protected abstract boolean handleDirectTextureChange(boolean hasDirectTexture);
+    protected abstract boolean shouldDrawProceed(int tileWidth, int tileHeight);
+    protected abstract void updateLayerAfterDraw(Rect updatedRect);
+    protected abstract IntSize getBufferSize();
+    protected abstract IntSize getTileSize();
+    protected abstract void tileLayerUpdated();
+    public abstract Bitmap getBitmap();
+    public abstract int getType();
+
+    public GeckoLayerClient(Context context) {
+        mScreenSize = new IntSize(0, 0);
+        mBufferSize = new IntSize(0, 0);
+    }
+
+    /** Attaches the root layer to the layer controller so that Gecko appears. */
+    @Override
+    public void setLayerController(LayerController layerController) {
+        super.setLayerController(layerController);
+
+        layerController.setRoot(mTileLayer);
+        if (mGeckoViewport != null) {
+            layerController.setViewportMetrics(mGeckoViewport);
+        }
+
+        //GeckoAppShell.registerGeckoEventListener("Viewport:UpdateAndDraw", this);
+        //GeckoAppShell.registerGeckoEventListener("Viewport:UpdateLater", this);
+
+        sendResizeEventIfNecessary();
+    }
+
+    public Rect beginDrawing(int width, int height, int tileWidth, int tileHeight,
+                             String metadata, boolean hasDirectTexture) {
+        Log.e(LOGTAG, "### beginDrawing " + width + " " + height + " " + tileWidth + " " +
+                tileHeight + " " + hasDirectTexture);
+
+        // If we've changed surface types, cancel this draw
+        if (handleDirectTextureChange(hasDirectTexture)) {
+            Log.e(LOGTAG, "### Cancelling draw due to direct texture change");
+            return null;
+        }
+
+        if (!shouldDrawProceed(tileWidth, tileHeight)) {
+            Log.e(LOGTAG, "### Cancelling draw due to shouldDrawProceed()");
+            return null;
+        }
+
+        LayerController controller = getLayerController();
+
+        try {
+            JSONObject viewportObject = new JSONObject(metadata);
+            mNewGeckoViewport = new ViewportMetrics(viewportObject);
+
+            Log.e(LOGTAG, "### beginDrawing new Gecko viewport " + mNewGeckoViewport);
+
+            // Update the background color, if it's present.
+            String backgroundColorString = viewportObject.optString("backgroundColor");
+            if (backgroundColorString != null && !backgroundColorString.equals(mLastCheckerboardColor)) {
+                mLastCheckerboardColor = backgroundColorString;
+                controller.setCheckerboardColor(parseColorFromGecko(backgroundColorString));
+            }
+        } catch (JSONException e) {
+            Log.e(LOGTAG, "Aborting draw, bad viewport description: " + metadata);
+            return null;
+        }
+
+
+        // Make sure we don't spend time painting areas we aren't interested in.
+        // Only do this if the Gecko viewport isn't going to override our viewport.
+        Rect bufferRect = new Rect(0, 0, width, height);
+
+        if (!mUpdateViewportOnEndDraw) {
+            // First, find out our ideal displayport. We do this by taking the
+            // clamped viewport origin and taking away the optimum viewport offset.
+            // This would be what we would send to Gecko if adjustViewport were
+            // called now.
+            ViewportMetrics currentMetrics = controller.getViewportMetrics();
+            PointF currentBestOrigin = RectUtils.getOrigin(currentMetrics.getClampedViewport());
+            PointF viewportOffset = currentMetrics.getOptimumViewportOffset(new IntSize(width, height));
+            currentBestOrigin.offset(-viewportOffset.x, -viewportOffset.y);
+
+            Rect currentRect = RectUtils.round(new RectF(currentBestOrigin.x, currentBestOrigin.y,
+                    currentBestOrigin.x + width, currentBestOrigin.y + height));
+
+            // Second, store Gecko's displayport.
+            PointF currentOrigin = mNewGeckoViewport.getDisplayportOrigin();
+            bufferRect = RectUtils.round(new RectF(currentOrigin.x, currentOrigin.y,
+                    currentOrigin.x + width, currentOrigin.y + height));
+
+
+            // Take the intersection of the two as the area we're interested in rendering.
+            if (!bufferRect.intersect(currentRect)) {
+                // If there's no intersection, we have no need to render anything,
+                // but make sure to update the viewport size.
+                beginTransaction(mTileLayer);
+                try {
+                    updateViewport(true);
+                } finally {
+                    endTransaction(mTileLayer);
+                }
+                return null;
+            }
+            bufferRect.offset(Math.round(-currentOrigin.x), Math.round(-currentOrigin.y));
+        }
+
+        beginTransaction(mTileLayer);
+        return bufferRect;
+    }
+
+    /*
+     * TODO: Would be cleaner if this took an android.graphics.Rect instead, but that would require
+     * a little more JNI magic.
+     */
+    public void endDrawing(int x, int y, int width, int height) {
+        synchronized (getLayerController()) {
+            try {
+                updateViewport(!mUpdateViewportOnEndDraw);
+                mUpdateViewportOnEndDraw = false;
+
+                Rect rect = new Rect(x, y, x + width, y + height);
+                updateLayerAfterDraw(rect);
+            } finally {
+                endTransaction(mTileLayer);
+            }
+        }
+        Log.i(LOGTAG, "zerdatime " + SystemClock.uptimeMillis() + " - endDrawing");
+
+        /* Used by robocop for testing purposes */
+        if (mDrawListener != null) {
+            mDrawListener.drawFinished(x, y, width, height);
+        }
+    }
+
+    protected void updateViewport(boolean onlyUpdatePageSize) {
+        // save and restore the viewport size stored in java; never let the
+        // JS-side viewport dimensions override the java-side ones because
+        // java is the One True Source of this information, and allowing JS
+        // to override can lead to race conditions where this data gets clobbered.
+        FloatSize viewportSize = getLayerController().getViewportSize();
+        mGeckoViewport = mNewGeckoViewport;
+        mGeckoViewport.setSize(viewportSize);
+
+        LayerController controller = getLayerController();
+        PointF displayportOrigin = mGeckoViewport.getDisplayportOrigin();
+        mTileLayer.setOrigin(PointUtils.round(displayportOrigin));
+        mTileLayer.setResolution(mGeckoViewport.getZoomFactor());
+
+        this.tileLayerUpdated();
+        Log.e(LOGTAG, "### updateViewport onlyUpdatePageSize=" + onlyUpdatePageSize +
+                " getTileViewport " + mGeckoViewport);
+
+        if (onlyUpdatePageSize) {
+            // Don't adjust page size when zooming unless zoom levels are
+            // approximately equal.
+            if (FloatUtils.fuzzyEquals(controller.getZoomFactor(),
+                    mGeckoViewport.getZoomFactor()))
+                controller.setPageSize(mGeckoViewport.getPageSize());
+        } else {
+            controller.setViewportMetrics(mGeckoViewport);
+            controller.abortPanZoomAnimation();
+        }
+    }
+
+    /* Informs Gecko that the screen size has changed. */
+    protected void sendResizeEventIfNecessary(boolean force) {
+        Log.e(LOGTAG, "### sendResizeEventIfNecessary " + force);
+
+        DisplayMetrics metrics = new DisplayMetrics();
+        /*GeckoApp*/LibreOfficeMainActivity.mAppContext.getWindowManager().getDefaultDisplay().getMetrics(metrics);
+
+        // Return immediately if the screen size hasn't changed or the viewport
+        // size is zero (which indicates that the rendering surface hasn't been
+        // allocated yet).
+        boolean screenSizeChanged = (metrics.widthPixels != mScreenSize.width ||
+                metrics.heightPixels != mScreenSize.height);
+        boolean viewportSizeValid = (getLayerController() != null &&
+                getLayerController().getViewportSize().isPositive());
+        if (!(force || (screenSizeChanged && viewportSizeValid))) {
+            return;
+        }
+
+        mScreenSize = new IntSize(metrics.widthPixels, metrics.heightPixels);
+        IntSize bufferSize = getBufferSize(), tileSize = getTileSize();
+
+        Log.e(LOGTAG, "### Screen-size changed to " + mScreenSize);
+        //GeckoEvent event = GeckoEvent.createSizeChangedEvent(bufferSize.width, bufferSize.height,
+        //        metrics.widthPixels, metrics.heightPixels,
+        //        tileSize.width, tileSize.height);
+        //GeckoAppShell.sendEventToGecko(event);
+        LOEvent event = LOEvent.sizeChanged(bufferSize.width, bufferSize.height,
+                                            metrics.widthPixels, metrics.heightPixels,
+                                            tileSize.width, tileSize.height);
+    }
+
+    // Parses a color from an RGB triple of the form "rgb([0-9]+, [0-9]+, [0-9]+)". If the color
+    // cannot be parsed, returns white.
+    private static int parseColorFromGecko(String string) {
+        if (sColorPattern == null) {
+            sColorPattern = Pattern.compile("rgb\\((\\d+),\\s*(\\d+),\\s*(\\d+)\\)");
+        }
+
+        Matcher matcher = sColorPattern.matcher(string);
+        if (!matcher.matches()) {
+            return Color.WHITE;
+        }
+
+        int r = Integer.parseInt(matcher.group(1));
+        int g = Integer.parseInt(matcher.group(2));
+        int b = Integer.parseInt(matcher.group(3));
+        return Color.rgb(r, g, b);
+    }
+
+    @Override
+    public void render() {
+        adjustViewportWithThrottling();
+    }
+
+    private void adjustViewportWithThrottling() {
+        if (!getLayerController().getRedrawHint())
+            return;
+
+        if (mPendingViewportAdjust)
+            return;
+
+        long timeDelta = System.currentTimeMillis() - mLastViewportChangeTime;
+        if (timeDelta < MIN_VIEWPORT_CHANGE_DELAY) {
+            getLayerController().getView().postDelayed(
+                    new Runnable() {
+                        public void run() {
+                            mPendingViewportAdjust = false;
+                            adjustViewport();
+                        }
+                    }, MIN_VIEWPORT_CHANGE_DELAY - timeDelta);
+            mPendingViewportAdjust = true;
+            return;
+        }
+
+        adjustViewport();
+    }
+
+    @Override
+    public void viewportSizeChanged() {
+        mViewportSizeChanged = true;
+    }
+
+    private void adjustViewport() {
+        ViewportMetrics viewportMetrics =
+                new ViewportMetrics(getLayerController().getViewportMetrics());
+
+        PointF viewportOffset = viewportMetrics.getOptimumViewportOffset(mBufferSize);
+        viewportMetrics.setViewportOffset(viewportOffset);
+        viewportMetrics.setViewport(viewportMetrics.getClampedViewport());
+
+        //GeckoAppShell.sendEventToGecko(GeckoEvent.createViewportEvent(viewportMetrics));
+        LOKitShell.sendEvent(LOEvent.viewport(viewportMetrics));
+        if (mViewportSizeChanged) {
+            mViewportSizeChanged = false;
+            //GeckoAppShell.viewSizeChanged();
+            LOKitShell.viewSizeChanged();
+        }
+
+        mLastViewportChangeTime = System.currentTimeMillis();
+    }
+
+    public void handleMessage(String event, JSONObject message) {
+        if ("Viewport:UpdateAndDraw".equals(event)) {
+            Log.e(LOGTAG, "### Java side Viewport:UpdateAndDraw()!");
+            mUpdateViewportOnEndDraw = true;
+
+            // Redraw everything.
+            Rect rect = new Rect(0, 0, mBufferSize.width, mBufferSize.height);
+            //GeckoAppShell.sendEventToGecko(GeckoEvent.createDrawEvent(rect));
+            LOKitShell.sendEvent(LOEvent.draw(rect));
+        } else if ("Viewport:UpdateLater".equals(event)) {
+            Log.e(LOGTAG, "### Java side Viewport:UpdateLater()!");
+            mUpdateViewportOnEndDraw = true;
+        }
+    }
+
+    @Override
+    public void geometryChanged() {
+        /* Let Gecko know if the screensize has changed */
+        sendResizeEventIfNecessary();
+        render();
+    }
+
+    public int getWidth() {
+        return mBufferSize.width;
+    }
+
+    public int getHeight() {
+        return mBufferSize.height;
+    }
+
+    public ViewportMetrics getGeckoViewportMetrics() {
+        // Return a copy, as we modify this inside the Gecko thread
+        if (mGeckoViewport != null)
+            return new ViewportMetrics(mGeckoViewport);
+        return null;
+    }
+
+    private void sendResizeEventIfNecessary() {
+        sendResizeEventIfNecessary(false);
+    }
+
+    /** Used by robocop for testing purposes. Not for production use! This is called via reflection by robocop. */
+    public void setDrawListener(DrawListener listener) {
+        mDrawListener = listener;
+    }
+
+    /** Used by robocop for testing purposes. Not for production use! This is used via reflection by robocop. */
+    public interface DrawListener {
+        public void drawFinished(int x, int y, int width, int height);
+    }
+}
+
diff --git a/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/GeckoSoftwareLayerClient.java b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/GeckoSoftwareLayerClient.java
new file mode 100644
index 000000000000..fa1d5adb3c70
--- /dev/null
+++ b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/GeckoSoftwareLayerClient.java
@@ -0,0 +1,322 @@
+/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
+ * ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Mozilla Android code.
+ *
+ * The Initial Developer of the Original Code is Mozilla Foundation.
+ * Portions created by the Initial Developer are Copyright (C) 2009-2010
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Patrick Walton <pcwalton@mozilla.com>
+ *   Chris Lord <chrislord.net@gmail.com>
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+package org.mozilla.gecko.gfx;
+
+import org.libreoffice.LOKitShell;
+import org.mozilla.gecko.gfx.CairoImage;
+import org.mozilla.gecko.gfx.IntSize;
+import org.mozilla.gecko.gfx.LayerClient;
+import org.mozilla.gecko.gfx.LayerController;
+import org.mozilla.gecko.gfx.LayerRenderer;
+import org.mozilla.gecko.gfx.MultiTileLayer;
+import org.mozilla.gecko.gfx.PointUtils;
+import org.mozilla.gecko.gfx.WidgetTileLayer;
+//import org.mozilla.gecko.GeckoAppShell;
+import android.content.Context;
+import android.graphics.Bitmap;
+import android.graphics.Canvas;
+import android.graphics.Point;
+import android.graphics.Rect;
+import android.graphics.RectF;
+import android.util.Log;
+import java.nio.ByteBuffer;
+
+/**
+ * Transfers a software-rendered Gecko to an ImageLayer so that it can be rendered by our
+ * compositor.
+ *
+ * TODO: Throttle down Gecko's priority when we pan and zoom.
+ */
+public class GeckoSoftwareLayerClient extends GeckoLayerClient {
+    private static final String LOGTAG = "GeckoSoftwareLayerClient";
+
+    private int mFormat;
+    private IntSize mViewportSize;
+    private ByteBuffer mBuffer;
+
+    private CairoImage mCairoImage;
+
+    private static final IntSize TILE_SIZE = new IntSize(256, 256);
+
+    // Whether or not the last paint we got used direct texturing
+    private boolean mHasDirectTexture;
+
+    public GeckoSoftwareLayerClient(Context context) {
+        super(context);
+
+        mFormat = CairoImage.FORMAT_ARGB32;
+
+        mCairoImage = new CairoImage() {
+            @Override
+            public ByteBuffer getBuffer() { return mBuffer; }
+            @Override
+            public IntSize getSize() { return mBufferSize; }
+            @Override
+            public int getFormat() { return mFormat; }
+        };
+    }
+
+    protected void finalize() throws Throwable {
+        try {
+            if (mBuffer != null)
+                LOKitShell.freeDirectBuffer(mBuffer);
+            mBuffer = null;
+        } finally {
+            super.finalize();
+        }
+    }
+
+    public void setLayerController(LayerController layerController) {
+        super.setLayerController(layerController);
+
+        layerController.setRoot(mTileLayer);
+        if (mGeckoViewport != null) {
+            layerController.setViewportMetrics(mGeckoViewport);
+        }
+
+        //GeckoAppShell.registerGeckoEventListener("Viewport:UpdateAndDraw", this);
+        //GeckoAppShell.registerGeckoEventListener("Viewport:UpdateLater", this);
+        //GeckoAppShell.registerGeckoEventListener("Checkerboard:Toggle", this);
+
+        // XXX: Review pcwalton. This signature changed on m-c, should force = false here?
+        sendResizeEventIfNecessary(false);
+    }
+
+    @Override
+    protected boolean handleDirectTextureChange(boolean hasDirectTexture) {
+        if (mTileLayer != null && hasDirectTexture == mHasDirectTexture)
+            return false;
+
+        mHasDirectTexture = hasDirectTexture;
+
+        if (mHasDirectTexture) {
+            Log.i(LOGTAG, "Creating WidgetTileLayer");
+            mTileLayer = new WidgetTileLayer(mCairoImage);
+        } else {
+            Log.i(LOGTAG, "Creating MultiTileLayer");
+            mTileLayer = new MultiTileLayer(mCairoImage, TILE_SIZE);
+        }
+
+        getLayerController().setRoot(mTileLayer);
+
+        // Force a resize event to be sent because the results of this
+        // are different depending on what tile system we're using
+        sendResizeEventIfNecessary(true);
+
+        return true;
+    }
+
+    @Override
+    protected boolean shouldDrawProceed(int tileWidth, int tileHeight) {
+        // Make sure the tile-size matches. If it doesn't, we could crash trying
+        // to access invalid memory.
+        if (mHasDirectTexture) {
+            if (tileWidth != 0 || tileHeight != 0) {
+                Log.e(LOGTAG, "Aborting draw, incorrect tile size of " + tileWidth + "x" +
+                        tileHeight);
+                return false;
+            }
+        } else {
+            if (tileWidth != TILE_SIZE.width || tileHeight != TILE_SIZE.height) {
+                Log.e(LOGTAG, "Aborting draw, incorrect tile size of " + tileWidth + "x" +
+                        tileHeight);
+                return false;
+            }
+        }
+
+        return true;
+    }
+
+    @Override
+    public Rect beginDrawing(int width, int height, int tileWidth, int tileHeight,
+                             String metadata, boolean hasDirectTexture) {
+        Rect bufferRect = super.beginDrawing(width, height, tileWidth, tileHeight,
+                metadata, hasDirectTexture);
+        if (bufferRect == null) {
+            return bufferRect;
+        }
+
+        // If the window size has changed, reallocate the buffer to match.
+        if (mBufferSize.width != width || mBufferSize.height != height) {
+            mBufferSize = new IntSize(width, height);
+
+            // Reallocate the buffer if necessary
+            if (mTileLayer instanceof MultiTileLayer) {
+                int bpp = CairoUtils.bitsPerPixelForCairoFormat(mFormat) / 8;
+                int size = mBufferSize.getArea() * bpp;
+                if (mBuffer == null || mBuffer.capacity() != size) {
+                    // Free the old buffer
+                    if (mBuffer != null) {
+                        LOKitShell.freeDirectBuffer(mBuffer);
+                        mBuffer = null;
+                    }
+
+                    mBuffer = LOKitShell.allocateDirectBuffer(size);
+                }
+            }
+        }
+
+        return bufferRect;
+    }
+
+    @Override
+    protected void updateLayerAfterDraw(Rect updatedRect) {
+        if (!(mTileLayer instanceof MultiTileLayer)) {
+            return;
+        }
+
+        ((MultiTileLayer)mTileLayer).invalidate(updatedRect);
+    }
+
+    private void copyPixelsFromMultiTileLayer(Bitmap target) {
+        Canvas c = new Canvas(target);
+        ByteBuffer tileBuffer = mBuffer.slice();
+        int bpp = CairoUtils.bitsPerPixelForCairoFormat(mFormat) / 8;
+
+        for (int y = 0; y < mBufferSize.height; y += TILE_SIZE.height) {
+            for (int x = 0; x < mBufferSize.width; x += TILE_SIZE.width) {
+                // Calculate tile size
+                IntSize tileSize = new IntSize(Math.min(mBufferSize.width - x, TILE_SIZE.width),
+                        Math.min(mBufferSize.height - y, TILE_SIZE.height));
+
+                // Create a Bitmap from this tile
+                Bitmap tile = Bitmap.createBitmap(tileSize.width, tileSize.height,
+                        CairoUtils.cairoFormatTobitmapConfig(mFormat));
+                tile.copyPixelsFromBuffer(tileBuffer.asIntBuffer());
+
+                // Copy the tile to the master Bitmap and recycle it
+                c.drawBitmap(tile, x, y, null);
+                tile.recycle();
+
+                // Progress the buffer to the next tile
+                tileBuffer.position(tileSize.getArea() * bpp);
+                tileBuffer = tileBuffer.slice();
+            }
+        }
+    }
+
+    @Override
+    protected void tileLayerUpdated() {
+        /* No-op. */
+    }
+
+    @Override
+    public Bitmap getBitmap() {
+        if (mTileLayer == null)
+            return null;
+
+        // Begin a tile transaction, otherwise the buffer can be destroyed while
+        // we're reading from it.
+        beginTransaction(mTileLayer);
+        try {
+            if (mBuffer == null || mBufferSize.width <= 0 || mBufferSize.height <= 0)
+                return null;
+            try {
+                Bitmap b = null;
+
+                if (mTileLayer instanceof MultiTileLayer) {
+                    b = Bitmap.createBitmap(mBufferSize.width, mBufferSize.height,
+                            CairoUtils.cairoFormatTobitmapConfig(mFormat));
+                    copyPixelsFromMultiTileLayer(b);
+                } else {
+                    Log.w(LOGTAG, "getBitmap() called on a layer (" + mTileLayer + ") we don't know how to get a bitmap from");
+                }
+
+                return b;
+            } catch (OutOfMemoryError oom) {
+                Log.w(LOGTAG, "Unable to create bitmap", oom);
+                return null;
+            }
+        } finally {
+            endTransaction(mTileLayer);
+        }
+    }
+
+    /** Returns the back buffer. This function is for Gecko to use. */
+    public ByteBuffer lockBuffer() {
+        return mBuffer;
+    }
+
+    /**
+     * Gecko calls this function to signal that it is done with the back buffer. After this call,
+     * it is forbidden for Gecko to touch the buffer.
+     */
+    public void unlockBuffer() {
+        /* no-op */
+    }
+
+    @Override
+    public int getType() {
+        return LAYER_CLIENT_TYPE_SOFTWARE;
+    }
+
+    @Override
+    protected IntSize getBufferSize() {
+        // Round up depending on layer implementation to remove texture wastage
+        if (!mHasDirectTexture) {
+            // Round to the next multiple of the tile size
+            return new IntSize(((mScreenSize.width + LayerController.MIN_BUFFER.width - 1) /
+                    TILE_SIZE.width + 1) * TILE_SIZE.width,
+                    ((mScreenSize.height + LayerController.MIN_BUFFER.height - 1) /
+                            TILE_SIZE.height + 1) * TILE_SIZE.height);
+        }
+
+        int maxSize = getLayerController().getView().getMaxTextureSize();
+
+        // XXX Integrate gralloc/tiling work to circumvent this
+        if (mScreenSize.width > maxSize || mScreenSize.height > maxSize) {
+            throw new RuntimeException("Screen size of " + mScreenSize +
+                    " larger than maximum texture size of " + maxSize);
+        }
+
+        // Round to next power of two until we have NPOT texture support, respecting maximum
+        // texture size
+        return new IntSize(Math.min(maxSize, IntSize.nextPowerOfTwo(mScreenSize.width +
+                LayerController.MIN_BUFFER.width)),
+                Math.min(maxSize, IntSize.nextPowerOfTwo(mScreenSize.height +
+                        LayerController.MIN_BUFFER.height)));
+    }
+
+    @Override
+    protected IntSize getTileSize() {
+        // Round up depending on layer implementation to remove texture wastage
+        return !mHasDirectTexture ? TILE_SIZE : new IntSize(0, 0);
+    }
+}
+
diff --git a/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/InputConnectionHandler.java b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/InputConnectionHandler.java
new file mode 100644
index 000000000000..6fef53fb0535
--- /dev/null
+++ b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/InputConnectionHandler.java
@@ -0,0 +1,15 @@
+package org.mozilla.gecko.gfx;
+
+import android.view.inputmethod.EditorInfo;
+import android.view.inputmethod.InputConnection;
+import android.view.KeyEvent;
+
+public interface InputConnectionHandler
+{
+    InputConnection onCreateInputConnection(EditorInfo outAttrs);
+    boolean onKeyPreIme(int keyCode, KeyEvent event);
+    boolean onKeyDown(int keyCode, KeyEvent event);
+    boolean onKeyLongPress(int keyCode, KeyEvent event);
+    boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event);
+    boolean onKeyUp(int keyCode, KeyEvent event);
+}
diff --git a/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/IntSize.java b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/IntSize.java
new file mode 100644
index 000000000000..ee43b1bf557b
--- /dev/null
+++ b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/IntSize.java
@@ -0,0 +1,103 @@
+/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
+ * ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Mozilla Android code.
+ *
+ * The Initial Developer of the Original Code is Mozilla Foundation.
+ * Portions created by the Initial Developer are Copyright (C) 2009-2010
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Patrick Walton <pcwalton@mozilla.com>
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+package org.mozilla.gecko.gfx;
+
+import org.mozilla.gecko.gfx.FloatSize;
+import org.json.JSONException;
+import org.json.JSONObject;
+import java.lang.Math;
+
+public class IntSize {
+    public final int width, height;
+
+    public IntSize(IntSize size) { width = size.width; height = size.height; }
+    public IntSize(int inWidth, int inHeight) { width = inWidth; height = inHeight; }
+
+    public IntSize(FloatSize size) {
+        width = Math.round(size.width);
+        height = Math.round(size.height);
+    }
+
+    public IntSize(JSONObject json) {
+        try {
+            width = json.getInt("width");
+            height = json.getInt("height");
+        } catch (JSONException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    public int getArea() {
+        return width * height;
+    }
+
+    public boolean equals(IntSize size) {
+        return ((size.width == width) && (size.height == height));
+    }
+
+    public boolean isPositive() {
+        return (width > 0 && height > 0);
+    }
+
+    @Override
+    public String toString() { return "(" + width + "," + height + ")"; }
+
+    public IntSize scale(float factor) {
+        return new IntSize(Math.round(width * factor),
+                           Math.round(height * factor));
+    }
+
+    /* Returns the power of two that is greater than or equal to value */
+    public static int nextPowerOfTwo(int value) {
+        // code taken from http://acius2.blogspot.com/2007/11/calculating-next-power-of-2.html
+        if (0 == value--) {
+            return 1;
+        }
+        value = (value >> 1) | value;
+        value = (value >> 2) | value;
+        value = (value >> 4) | value;
+        value = (value >> 8) | value;
+        value = (value >> 16) | value;
+        return value + 1;
+    }
+
+    public IntSize nextPowerOfTwo() {
+        return new IntSize(nextPowerOfTwo(width), nextPowerOfTwo(height));
+    }
+}
+
diff --git a/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/Layer.java b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/Layer.java
new file mode 100644
index 000000000000..2dd3316f0016
--- /dev/null
+++ b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/Layer.java
@@ -0,0 +1,242 @@
+/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
+ * ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Mozilla Android code.
+ *
+ * The Initial Developer of the Original Code is Mozilla Foundation.
+ * Portions created by the Initial Developer are Copyright (C) 2009-2010
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Patrick Walton <pcwalton@mozilla.com>
+ *   Chris Lord <chrislord.net@gmail.com>
+ *   Arkady Blyakher <rkadyb@mit.edu>
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+package org.mozilla.gecko.gfx;
+
+import android.graphics.Point;
+import android.graphics.RectF;
+import android.graphics.Region;
+
+import org.mozilla.gecko.util.FloatUtils;
+
+import java.nio.FloatBuffer;
+import java.util.concurrent.locks.ReentrantLock;
+
+public abstract class Layer {
+    private final ReentrantLock mTransactionLock;
+    protected Point mOrigin;
+    protected float mResolution;
+    private boolean mInTransaction;
+    private Point mNewOrigin;
+    private float mNewResolution;
+    private LayerView mView;
+
+    public Layer() {
+        mTransactionLock = new ReentrantLock();
+        mOrigin = new Point(0, 0);
+        mResolution = 1.0f;
+    }
+
+    /**
+     * Updates the layer. This returns false if there is still work to be done
+     * after this update.
+     */
+    public final boolean update(RenderContext context) {
+        if (mTransactionLock.isHeldByCurrentThread()) {
+            throw new RuntimeException("draw() called while transaction lock held by this " +
+                    "thread?!");
+        }
+
+        if (mTransactionLock.tryLock()) {
+            try {
+                return performUpdates(context);
+            } finally {
+                mTransactionLock.unlock();
+            }
+        }
+
+        return false;
+    }
+
+    /**
+     * Subclasses override this function to draw the layer.
+     */
+    public abstract void draw(RenderContext context);
+
+    /**
+     * Subclasses override this function to provide access to the size of the layer.
+     */
+    public abstract IntSize getSize();
+
+    /**
+     * Given the intrinsic size of the layer, returns the pixel boundaries of the layer rect.
+     */
+    protected RectF getBounds(RenderContext context, FloatSize size) {
+        float scaleFactor = context.zoomFactor / mResolution;
+        float x = mOrigin.x * scaleFactor, y = mOrigin.y * scaleFactor;
+        float width = size.width * scaleFactor, height = size.height * scaleFactor;
+        return new RectF(x, y, x + width, y + height);
+    }
+
+    /**
+     * Returns the region of the layer that is considered valid. The default
+     * implementation of this will return the bounds of the layer, but this
+     * may be overridden.
+     */
+    public Region getValidRegion(RenderContext context) {
+        return new Region(RectUtils.round(getBounds(context, new FloatSize(getSize()))));
+    }
+
+    /**
+     * Call this before modifying the layer. Note that, for TileLayers, "modifying the layer"
+     * includes altering the underlying CairoImage in any way. Thus you must call this function
+     * before modifying the byte buffer associated with this layer.
+     * <p/>
+     * This function may block, so you should never call this on the main UI thread.
+     */
+    public void beginTransaction(LayerView aView) {
+        if (mTransactionLock.isHeldByCurrentThread())
+            throw new RuntimeException("Nested transactions are not supported");
+        mTransactionLock.lock();
+        mView = aView;
+        mInTransaction = true;
+        mNewResolution = mResolution;
+    }
+
+    public void beginTransaction() {
+        beginTransaction(null);
+    }
+
+    /**
+     * Call this when you're done modifying the layer.
+     */
+    public void endTransaction() {
+        if (!mInTransaction)
+            throw new RuntimeException("endTransaction() called outside a transaction");
+        mInTransaction = false;
+        mTransactionLock.unlock();
+
+        if (mView != null)
+            mView.requestRender();
+    }
+
+    /**
+     * Returns true if the layer is currently in a transaction and false otherwise.
+     */
+    protected boolean inTransaction() {
+        return mInTransaction;
+    }
+
+    /**
+     * Returns the current layer origin.
+     */
+    public Point getOrigin() {
+        return mOrigin;
+    }
+
+    /**
+     * Sets the origin. Only valid inside a transaction.
+     */
+    public void setOrigin(Point newOrigin) {
+        if (!mInTransaction)
+            throw new RuntimeException("setOrigin() is only valid inside a transaction");
+        mNewOrigin = newOrigin;
+    }
+
+    /**
+     * Returns the current layer's resolution.
+     */
+    public float getResolution() {
+        return mResolution;
+    }
+
+    /**
+     * Sets the layer resolution. This value is used to determine how many pixels per
+     * device pixel this layer was rendered at. This will be reflected by scaling by
+     * the reciprocal of the resolution in the layer's transform() function.
+     * Only valid inside a transaction.
+     */
+    public void setResolution(float newResolution) {
+        if (!mInTransaction)
+            throw new RuntimeException("setResolution() is only valid inside a transaction");
+        mNewResolution = newResolution;
+    }
+
+    /**
+     * Subclasses may override this method to perform custom layer updates. This will be called
+     * with the transaction lock held. Subclass implementations of this method must call the
+     * superclass implementation. Returns false if there is still work to be done after this
+     * update is complete.
+     */
+    protected boolean performUpdates(RenderContext context) {
+        if (mNewOrigin != null) {
+            mOrigin = mNewOrigin;
+            mNewOrigin = null;
+        }
+        if (mNewResolution != 0.0f) {
+            mResolution = mNewResolution;
+            mNewResolution = 0.0f;
+        }
+
+        return true;
+    }
+
+    protected boolean dimensionChangesPending() {
+        return (mNewOrigin != null) || (mNewResolution != 0.0f);
+    }
+
+    public static class RenderContext {
+        public final RectF viewport;
+        public final FloatSize pageSize;
+        public final float zoomFactor;
+        public final int positionHandle;
+        public final int textureHandle;
+        public final FloatBuffer coordBuffer;
+
+        public RenderContext(RectF aViewport, FloatSize aPageSize, float aZoomFactor,
+                             int aPositionHandle, int aTextureHandle, FloatBuffer aCoordBuffer) {
+            viewport = aViewport;
+            pageSize = aPageSize;
+            zoomFactor = aZoomFactor;
+            positionHandle = aPositionHandle;
+            textureHandle = aTextureHandle;
+            coordBuffer = aCoordBuffer;
+        }
+
+        public boolean fuzzyEquals(RenderContext other) {
+            if (other == null) {
+                return false;
+            }
+            return RectUtils.fuzzyEquals(viewport, other.viewport)
+                    && pageSize.fuzzyEquals(other.pageSize)
+                    && FloatUtils.fuzzyEquals(zoomFactor, other.zoomFactor);
+        }
+    }
+}
+
diff --git a/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/LayerClient.java b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/LayerClient.java
new file mode 100644
index 000000000000..4f461088203e
--- /dev/null
+++ b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/LayerClient.java
@@ -0,0 +1,81 @@
+/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
+ * ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Mozilla Android code.
+ *
+ * The Initial Developer of the Original Code is Mozilla Foundation.
+ * Portions created by the Initial Developer are Copyright (C) 2009-2010
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Patrick Walton <pcwalton@mozilla.com>
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+package org.mozilla.gecko.gfx;
+
+/**
+ * A layer client provides tiles and manages other information used by the layer controller.
+ */
+public abstract class LayerClient {
+    private LayerController mLayerController;
+
+    public abstract void geometryChanged();
+
+    public abstract void viewportSizeChanged();
+
+    protected abstract void render();
+
+    public LayerController getLayerController() {
+        return mLayerController;
+    }
+
+    public void setLayerController(LayerController layerController) {
+        mLayerController = layerController;
+    }
+
+    /**
+     * A utility function for calling Layer.beginTransaction with the
+     * appropriate LayerView.
+     */
+    public void beginTransaction(Layer aLayer) {
+        if (mLayerController != null) {
+            LayerView view = mLayerController.getView();
+            if (view != null) {
+                aLayer.beginTransaction(view);
+                return;
+            }
+        }
+
+        aLayer.beginTransaction();
+    }
+
+    // Included for symmetry.
+    public void endTransaction(Layer aLayer) {
+        aLayer.endTransaction();
+    }
+}
+
diff --git a/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/LayerController.java b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/LayerController.java
new file mode 100644
index 000000000000..250dc84c69fe
--- /dev/null
+++ b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/LayerController.java
@@ -0,0 +1,534 @@
+/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
+ * ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Mozilla Android code.
+ *
+ * The Initial Developer of the Original Code is Mozilla Foundation.
+ * Portions created by the Initial Developer are Copyright (C) 2009-2010
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Patrick Walton <pcwalton@mozilla.com>
+ *   Chris Lord <chrislord.net@gmail.com>
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+package org.mozilla.gecko.gfx;
+
+import android.content.Context;
+import android.content.res.Resources;
+import android.graphics.Bitmap;
+import android.graphics.BitmapFactory;
+import android.graphics.Point;
+import android.graphics.PointF;
+import android.graphics.RectF;
+import android.util.Log;
+import android.view.GestureDetector;
+import android.view.MotionEvent;
+import android.view.View.OnTouchListener;
+
+import org.mozilla.gecko.ui.PanZoomController;
+import org.mozilla.gecko.ui.SimpleScaleGestureDetector;
+
+import java.util.Timer;
+import java.util.TimerTask;
+
+/**
+ * The layer controller manages a tile that represents the visible page. It does panning and
+ * zooming natively by delegating to a panning/zooming controller. Touch events can be dispatched
+ * to a higher-level view.
+ * <p/>
+ * Many methods require that the monitor be held, with a synchronized (controller) { ... } block.
+ */
+public class LayerController {
+    /* The extra area on the sides of the page that we want to buffer to help with
+     * smooth, asynchronous scrolling. Depending on a device's support for NPOT
+     * textures, this may be rounded up to the nearest power of two.
+     */
+    public static final IntSize MIN_BUFFER = new IntSize(512, 1024);
+    private static final String LOGTAG = "GeckoLayerController";
+    /* If the visible rect is within the danger zone (measured in pixels from each edge of a tile),
+     * we start aggressively redrawing to minimize checkerboarding. */
+    private static final int DANGER_ZONE_X = 75;
+    private static final int DANGER_ZONE_Y = 150;
+    /* The time limit for pages to respond with preventDefault on touchevents
+     * before we begin panning the page */
+    private static final int PREVENT_DEFAULT_TIMEOUT = 200;
+    private Layer mRootLayer;                   /* The root layer. */
+    private LayerView mView;                    /* The main rendering view. */
+    /*
+     * The panning and zooming controller, which interprets pan and zoom gestures for us and
+     * updates our visible rect appropriately.
+     */
+    private Context mContext;                   /* The current context. */
+    private ViewportMetrics mViewportMetrics;   /* The current viewport metrics. */
+    private boolean mWaitForTouchListeners;
+    private PanZoomController mPanZoomController;
+    private OnTouchListener mOnTouchListener;       /* The touch listener. */
+    private LayerClient mLayerClient;               /* The layer client. */
+    /* The new color for the checkerboard. */
+    private int mCheckerboardColor;
+    private boolean mCheckerboardShouldShowChecks;
+    private boolean mForceRedraw;
+    private boolean allowDefaultActions = true;
+    private Timer allowDefaultTimer = null;
+    private boolean inTouchSession = false;
+    private PointF initialTouchLocation = null;
+
+    public LayerController(Context context) {
+        mContext = context;
+
+        mForceRedraw = true;
+        mViewportMetrics = new ViewportMetrics();
+        mPanZoomController = new PanZoomController(this);
+        mView = new LayerView(context, this);
+    }
+
+    public void setForceRedraw() {
+        mForceRedraw = true;
+    }
+
+    public LayerClient getLayerClient() {
+        return mLayerClient;
+    }
+
+    public void setLayerClient(LayerClient layerClient) {
+        mLayerClient = layerClient;
+        layerClient.setLayerController(this);
+    }
+
+    public Layer getRoot() {
+        return mRootLayer;
+    }
+
+    public void setRoot(Layer layer) {
+        mRootLayer = layer;
+    }
+
+    public LayerView getView() {
+        return mView;
+    }
+
+    public Context getContext() {
+        return mContext;
+    }
+
+    public ViewportMetrics getViewportMetrics() {
+        return mViewportMetrics;
+    }
+
+    /**
+     * Sets the entire viewport metrics at once. This function does not notify the layer client or
+     * the pan/zoom controller, so you will need to call notifyLayerClientOfGeometryChange() or
+     * notifyPanZoomControllerOfGeometryChange() after calling this. You must hold the monitor
+     * while calling this.
+     */
+    public void setViewportMetrics(ViewportMetrics viewport) {
+        mViewportMetrics = new ViewportMetrics(viewport);
+        Log.d(LOGTAG, "setViewportMetrics: " + mViewportMetrics);
+        // this function may or may not be called on the UI thread,
+        // but repositionPluginViews must only be called on the UI thread.
+        //GeckoApp.mAppContext.runOnUiThread(new Runnable() {
+        //    public void run() {
+        //        GeckoApp.mAppContext.repositionPluginViews(false);
+        //    }
+        //});
+        mView.requestRender();
+    }
+
+    public RectF getViewport() {
+        return mViewportMetrics.getViewport();
+    }
+
+    public FloatSize getViewportSize() {
+        return mViewportMetrics.getSize();
+    }
+
+    /**
+     * The view calls this function to indicate that the viewport changed size. It must hold the
+     * monitor while calling it.
+     * <p/>
+     * TODO: Refactor this to use an interface. Expose that interface only to the view and not
+     * to the layer client. That way, the layer client won't be tempted to call this, which might
+     * result in an infinite loop.
+     */
+    public void setViewportSize(FloatSize size) {
+        // Resize the viewport, and modify its zoom factor so that the page retains proportionally
+        // zoomed relative to the screen.
+        float oldHeight = mViewportMetrics.getSize().height;
+        float oldWidth = mViewportMetrics.getSize().width;
+        float oldZoomFactor = mViewportMetrics.getZoomFactor();
+        mViewportMetrics.setSize(size);
+
+        // if the viewport got larger (presumably because the vkb went away), and the page
+        // is smaller than the new viewport size, increase the page size so that the panzoomcontroller
+        // doesn't zoom in to make it fit (bug 718270). this page size change is in anticipation of
+        // gecko increasing the page size to match the new viewport size, which will happen the next
+        // time we get a draw update.
+        if (size.width >= oldWidth && size.height >= oldHeight) {
+            FloatSize pageSize = mViewportMetrics.getPageSize();
+            if (pageSize.width < size.width || pageSize.height < size.height) {
+                mViewportMetrics.setPageSize(new FloatSize(Math.max(pageSize.width, size.width),
+                        Math.max(pageSize.height, size.height)));
+            }
+        }
+
+        PointF newFocus = new PointF(size.width / 2.0f, size.height / 2.0f);
+        float newZoomFactor = size.width * oldZoomFactor / oldWidth;
+        mViewportMetrics.scaleTo(newZoomFactor, newFocus);
+
+        Log.d(LOGTAG, "setViewportSize: " + mViewportMetrics);
+        setForceRedraw();
+
+        if (mLayerClient != null)
+            mLayerClient.viewportSizeChanged();
+
+        notifyLayerClientOfGeometryChange();
+        mPanZoomController.abortAnimation();
+        mView.requestRender();
+    }
+
+    public FloatSize getPageSize() {
+        return mViewportMetrics.getPageSize();
+    }
+
+    /**
+     * Sets the current page size. You must hold the monitor while calling this.
+     */
+    public void setPageSize(FloatSize size) {
+        if (mViewportMetrics.getPageSize().fuzzyEquals(size))
+            return;
+
+        mViewportMetrics.setPageSize(size);
+        Log.d(LOGTAG, "setPageSize: " + mViewportMetrics);
+
+        // Page size is owned by the LayerClient, so no need to notify it of
+        // this change.
+
+        mView.post(new Runnable() {
+            public void run() {
+                mPanZoomController.pageSizeUpdated();
+                mView.requestRender();
+            }
+        });
+    }
+
+    public PointF getOrigin() {
+        return mViewportMetrics.getOrigin();
+    }
+
+    public float getZoomFactor() {
+        return mViewportMetrics.getZoomFactor();
+    }
+
+    public Bitmap getBackgroundPattern() {
+        return getDrawable("background");
+    }
+
+    public Bitmap getShadowPattern() {
+        return getDrawable("shadow");
+    }
+
+    public PanZoomController getPanZoomController() {
+        return mPanZoomController;
+    }
+
+    public GestureDetector.OnGestureListener getGestureListener() {
+        return mPanZoomController;
+    }
+
+    public SimpleScaleGestureDetector.SimpleScaleGestureListener getScaleGestureListener() {
+        return mPanZoomController;
+    }
+
+    public GestureDetector.OnDoubleTapListener getDoubleTapListener() {
+        return mPanZoomController;
+    }
+
+    public Bitmap getDrawable(String name) {
+        Resources resources = mContext.getResources();
+        int resourceID = resources.getIdentifier(name, "drawable", mContext.getPackageName());
+        BitmapFactory.Options options = new BitmapFactory.Options();
+        options.inScaled = false;
+        return BitmapFactory.decodeResource(mContext.getResources(), resourceID, options);
+    }
+
+    public Bitmap getDrawable16(String name) {
+        Resources resources = mContext.getResources();
+        int resourceID = resources.getIdentifier(name, "drawable", mContext.getPackageName());
+        BitmapFactory.Options options = new BitmapFactory.Options();
+        options.inScaled = false;
+        options.inPreferredConfig = Bitmap.Config.RGB_565;
+        return BitmapFactory.decodeResource(mContext.getResources(), resourceID, options);
+    }
+
+    /**
+     * Scrolls the viewport by the given offset. You must hold the monitor while calling this.
+     */
+    public void scrollBy(PointF point) {
+        PointF origin = mViewportMetrics.getOrigin();
+        origin.offset(point.x, point.y);
+        mViewportMetrics.setOrigin(origin);
+        Log.d(LOGTAG, "scrollBy: " + mViewportMetrics);
+
+        notifyLayerClientOfGeometryChange();
+        //GeckoApp.mAppContext.repositionPluginViews(false);
+        mView.requestRender();
+    }
+
+    /**
+     * Scales the viewport, keeping the given focus point in the same place before and after the
+     * scale operation. You must hold the monitor while calling this.
+     */
+    public void scaleWithFocus(float zoomFactor, PointF focus) {
+        mViewportMetrics.scaleTo(zoomFactor, focus);
+        Log.d(LOGTAG, "scaleWithFocus: " + mViewportMetrics + "; zf=" + zoomFactor);
+
+        // We assume the zoom level will only be modified by the
+        // PanZoomController, so no need to notify it of this change.
+        notifyLayerClientOfGeometryChange();
+        //GeckoApp.mAppContext.repositionPluginViews(false);
+        mView.requestRender();
+    }
+
+    public boolean post(Runnable action) {
+        return mView.post(action);
+    }
+
+    public void setOnTouchListener(OnTouchListener onTouchListener) {
+        mOnTouchListener = onTouchListener;
+    }
+
+    /**
+     * The view as well as the controller itself use this method to notify the layer client that
+     * the geometry changed.
+     */
+    public void notifyLayerClientOfGeometryChange() {
+        if (mLayerClient != null)
+            mLayerClient.geometryChanged();
+    }
+
+    /**
+     * Aborts any pan/zoom animation that is currently in progress.
+     */
+    public void abortPanZoomAnimation() {
+        if (mPanZoomController != null) {
+            mView.post(new Runnable() {
+                public void run() {
+                    mPanZoomController.abortAnimation();
+                }
+            });
+        }
+    }
+
+    /**
+     * Returns true if this controller is fine with performing a redraw operation or false if it
+     * would prefer that the action didn't take place.
+     */
+    public boolean getRedrawHint() {
+        // FIXME: Allow redraw while a finger is down, but only if we're about to checkerboard.
+        // This requires fixing aboutToCheckerboard() to know about the new buffer size.
+
+        if (mForceRedraw) {
+            mForceRedraw = false;
+            return true;
+        }
+
+        return mPanZoomController.getRedrawHint();
+    }
+
+    private RectF getTileRect() {
+        if (mRootLayer == null)
+            return new RectF();
+
+        float x = mRootLayer.getOrigin().x, y = mRootLayer.getOrigin().y;
+        IntSize layerSize = mRootLayer.getSize();
+        return new RectF(x, y, x + layerSize.width, y + layerSize.height);
+    }
+
+    // Returns true if a checkerboard is about to be visible.
+    private boolean aboutToCheckerboard() {
+        // Increase the size of the viewport (and clamp to page boundaries), and
+        // intersect it with the tile's displayport to determine whether we're
+        // close to checkerboarding.
+        FloatSize pageSize = getPageSize();
+        RectF adjustedViewport = RectUtils.expand(getViewport(), DANGER_ZONE_X, DANGER_ZONE_Y);
+        if (adjustedViewport.top < 0) adjustedViewport.top = 0;
+        if (adjustedViewport.left < 0) adjustedViewport.left = 0;
+        if (adjustedViewport.right > pageSize.width) adjustedViewport.right = pageSize.width;
+        if (adjustedViewport.bottom > pageSize.height) adjustedViewport.bottom = pageSize.height;
+
+        return !getTileRect().contains(adjustedViewport);
+    }
+
+    /**
+     * Converts a point from layer view coordinates to layer coordinates. In other words, given a
+     * point measured in pixels from the top left corner of the layer view, returns the point in
+     * pixels measured from the top left corner of the root layer, in the coordinate system of the
+     * layer itself. This method is used by the viewport controller as part of the process of
+     * translating touch events to Gecko's coordinate system.
+     */
+    public PointF convertViewPointToLayerPoint(PointF viewPoint) {
+        if (mRootLayer == null)
+            return null;
+
+        // Undo the transforms.
+        PointF origin = mViewportMetrics.getOrigin();
+        PointF newPoint = new PointF(origin.x, origin.y);
+        newPoint.offset(viewPoint.x, viewPoint.y);
+
+        Point rootOrigin = mRootLayer.getOrigin();
+        newPoint.offset(-rootOrigin.x, -rootOrigin.y);
+
+        return newPoint;
+    }
+
+    /*
+     * Gesture detection. This is handled only at a high level in this class; we dispatch to the
+     * pan/zoom controller to do the dirty work.
+     */
+    public boolean onTouchEvent(MotionEvent event) {
+        int action = event.getAction();
+        PointF point = new PointF(event.getX(), event.getY());
+
+        if ((action & MotionEvent.ACTION_MASK) == MotionEvent.ACTION_DOWN) {
+            mView.clearEventQueue();
+            initialTouchLocation = point;
+            allowDefaultActions = !mWaitForTouchListeners;
+            post(new Runnable() {
+                public void run() {
+                    preventPanning(mWaitForTouchListeners);
+                }
+            });
+        }
+
+        // After the initial touch, ignore touch moves until they exceed a minimum distance.
+        if (initialTouchLocation != null && (action & MotionEvent.ACTION_MASK) == MotionEvent.ACTION_MOVE) {
+            if (PointUtils.subtract(point, initialTouchLocation).length() > PanZoomController.PAN_THRESHOLD) {
+                initialTouchLocation = null;
+            } else {
+                return !allowDefaultActions;
+            }
+        }
+
+        if (mOnTouchListener != null)
+            mOnTouchListener.onTouch(mView, event);
+
+        if (!mWaitForTouchListeners)
+            return !allowDefaultActions;
+
+        boolean createTimer = false;
+        switch (action & MotionEvent.ACTION_MASK) {
+            case MotionEvent.ACTION_MOVE: {
+                if (!inTouchSession && allowDefaultTimer == null) {
+                    inTouchSession = true;
+                    createTimer = true;
+                }
+                break;
+            }
+            case MotionEvent.ACTION_CANCEL:
+            case MotionEvent.ACTION_UP: {
+                // if we still have initialTouchLocation, we haven't fired any
+                // touchmove events. We should start the timer to wait for preventDefault
+                // from touchstart. If we don't hear from it we fire mouse events
+                if (initialTouchLocation != null)
+                    createTimer = true;
+                inTouchSession = false;
+            }
+        }
+
+        if (createTimer) {
+            if (allowDefaultTimer != null) {
+                allowDefaultTimer.cancel();
+            }
+            allowDefaultTimer = new Timer();
+            allowDefaultTimer.schedule(new TimerTask() {
+                public void run() {
+                    post(new Runnable() {
+                        public void run() {
+                            preventPanning(false);
+                        }
+                    });
+                }
+            }, PREVENT_DEFAULT_TIMEOUT);
+        }
+
+        return !allowDefaultActions;
+    }
+
+    public void preventPanning(boolean aValue) {
+        if (allowDefaultTimer != null) {
+            allowDefaultTimer.cancel();
+            allowDefaultTimer.purge();
+            allowDefaultTimer = null;
+        }
+        if (aValue == allowDefaultActions) {
+            allowDefaultActions = !aValue;
+
+            if (aValue) {
+                mView.clearEventQueue();
+                mPanZoomController.cancelTouch();
+            } else {
+                mView.processEventQueue();
+            }
+        }
+    }
+
+    public void setWaitForTouchListeners(boolean aValue) {
+        mWaitForTouchListeners = aValue;
+    }
+
+    /**
+     * Retrieves whether we should show checkerboard checks or not.
+     */
+    public boolean checkerboardShouldShowChecks() {
+        return mCheckerboardShouldShowChecks;
+    }
+
+    /**
+     * Retrieves the color that the checkerboard should be.
+     */
+    public int getCheckerboardColor() {
+        return mCheckerboardColor;
+    }
+
+    /**
+     * Sets a new color for the checkerboard.
+     */
+    public void setCheckerboardColor(int newColor) {
+        mCheckerboardColor = newColor;
+        mView.requestRender();
+    }
+
+    /**
+     * Sets whether or not the checkerboard should show checkmarks.
+     */
+    public void setCheckerboardShowChecks(boolean showChecks) {
+        mCheckerboardShouldShowChecks = showChecks;
+        mView.requestRender();
+    }
+}
+
diff --git a/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/LayerRenderer.java b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/LayerRenderer.java
new file mode 100644
index 000000000000..6690aad8ec16
--- /dev/null
+++ b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/LayerRenderer.java
@@ -0,0 +1,689 @@
+/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
+ * ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Mozilla Android code.
+ *
+ * The Initial Developer of the Original Code is Mozilla Foundation.
+ * Portions created by the Initial Developer are Copyright (C) 2009-2010
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Patrick Walton <pcwalton@mozilla.com>
+ *   Chris Lord <chrislord.net@gmail.com>
+ *   Arkady Blyakher <rkadyb@mit.edu>
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+package org.mozilla.gecko.gfx;
+
+import org.libreoffice.LOKitShell;
+import org.mozilla.gecko.gfx.BufferedCairoImage;
+import org.mozilla.gecko.gfx.IntSize;
+import org.mozilla.gecko.gfx.Layer.RenderContext;
+import org.mozilla.gecko.gfx.LayerController;
+import org.mozilla.gecko.gfx.NinePatchTileLayer;
+import org.mozilla.gecko.gfx.SingleTileLayer;
+import org.mozilla.gecko.gfx.TextureReaper;
+import org.mozilla.gecko.gfx.TextureGenerator;
+import org.mozilla.gecko.gfx.TextLayer;
+import org.mozilla.gecko.gfx.TileLayer;
+//import org.mozilla.gecko.GeckoAppShell;
+import android.content.Context;
+import android.content.SharedPreferences;
+import android.graphics.Point;
+import android.graphics.PointF;
+import android.graphics.Rect;
+import android.graphics.RectF;
+import android.graphics.Region;
+import android.graphics.RegionIterator;
+import android.opengl.GLES20;
+import android.opengl.GLSurfaceView;
+import android.os.SystemClock;
+import android.util.DisplayMetrics;
+import android.util.Log;
+import android.view.WindowManager;
+import javax.microedition.khronos.egl.EGLConfig;
+import javax.microedition.khronos.opengles.GL10;
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+import java.nio.FloatBuffer;
+import java.nio.IntBuffer;
+import java.util.ArrayList;
+
+/**
+ * The layer renderer implements the rendering logic for a layer view.
+ */
+public class LayerRenderer implements GLSurfaceView.Renderer {
+    private static final String LOGTAG = "GeckoLayerRenderer";
+    private static final String PROFTAG = "GeckoLayerRendererProf";
+
+    /*
+     * The amount of time a frame is allowed to take to render before we declare it a dropped
+     * frame.
+     */
+    private static final int MAX_FRAME_TIME = 16;   /* 1000 ms / 60 FPS */
+
+    private static final int FRAME_RATE_METER_WIDTH = 64;
+    private static final int FRAME_RATE_METER_HEIGHT = 32;
+
+    private final LayerView mView;
+    private final SingleTileLayer mBackgroundLayer;
+    private final CheckerboardImage mCheckerboardImage;
+    private final SingleTileLayer mCheckerboardLayer;
+    private final NinePatchTileLayer mShadowLayer;
+    private final TextLayer mFrameRateLayer;
+    private final ScrollbarLayer mHorizScrollLayer;
+    private final ScrollbarLayer mVertScrollLayer;
+    private final FadeRunnable mFadeRunnable;
+    private final FloatBuffer mCoordBuffer;
+    private RenderContext mLastPageContext;
+    private int mMaxTextureSize;
+
+    private ArrayList<Layer> mExtraLayers = new ArrayList<Layer>();
+
+    // Dropped frames display
+    private int[] mFrameTimings;
+    private int mCurrentFrame, mFrameTimingsSum, mDroppedFrames;
+    private boolean mShowFrameRate;
+
+    // Render profiling output
+    private int mFramesRendered;
+    private float mCompleteFramesRendered;
+    private boolean mProfileRender;
+    private long mProfileOutputTime;
+
+    /* Used by robocop for testing purposes */
+    private IntBuffer mPixelBuffer;
+
+    // Used by GLES 2.0
+    private int mProgram;
+    private int mPositionHandle;
+    private int mTextureHandle;
+    private int mSampleHandle;
+    private int mTMatrixHandle;
+
+    // column-major matrix applied to each vertex to shift the viewport from
+    // one ranging from (-1, -1),(1,1) to (0,0),(1,1) and to scale all sizes by
+    // a factor of 2 to fill up the screen
+    private static final float[] TEXTURE_MATRIX = {
+            2.0f, 0.0f, 0.0f, 0.0f,
+            0.0f, 2.0f, 0.0f, 0.0f,
+            0.0f, 0.0f, 2.0f, 0.0f,
+            -1.0f, -1.0f, 0.0f, 1.0f
+    };
+
+    private static final int COORD_BUFFER_SIZE = 20;
+
+    // The shaders run on the GPU directly, the vertex shader is only applying the
+    // matrix transform detailed above
+    private static final String VERTEX_SHADER =
+            "uniform mat4 uTMatrix;\n" +
+                    "attribute vec4 vPosition;\n" +
+                    "attribute vec2 aTexCoord;\n" +
+                    "varying vec2 vTexCoord;\n" +
+                    "void main() {\n" +
+                    "    gl_Position = uTMatrix * vPosition;\n" +
+                    "    vTexCoord = aTexCoord;\n" +
+                    "}\n";
+
+    // Note we flip the y-coordinate in the fragment shader from a
+    // coordinate system with (0,0) in the top left to one with (0,0) in
+    // the bottom left.
+    private static final String FRAGMENT_SHADER =
+            "precision mediump float;\n" +
+                    "varying vec2 vTexCoord;\n" +
+                    "uniform sampler2D sTexture;\n" +
+                    "void main() {\n" +
+                    "    gl_FragColor = texture2D(sTexture, vec2(vTexCoord.x, 1.0 - vTexCoord.y));\n" +
+                    "}\n";
+
+    public LayerRenderer(LayerView view) {
+        mView = view;
+
+        LayerController controller = view.getController();
+
+        CairoImage backgroundImage = new BufferedCairoImage(controller.getBackgroundPattern());
+        mBackgroundLayer = new SingleTileLayer(true, backgroundImage);
+
+        mCheckerboardImage = new CheckerboardImage();
+        mCheckerboardLayer = new SingleTileLayer(true, mCheckerboardImage);
+
+        CairoImage shadowImage = new BufferedCairoImage(controller.getShadowPattern());
+        mShadowLayer = new NinePatchTileLayer(shadowImage);
+
+        IntSize frameRateLayerSize = new IntSize(FRAME_RATE_METER_WIDTH, FRAME_RATE_METER_HEIGHT);
+        mFrameRateLayer = TextLayer.create(frameRateLayerSize, "-- ms/--");
+
+        mHorizScrollLayer = ScrollbarLayer.create(false);
+        mVertScrollLayer = ScrollbarLayer.create(true);
+        mFadeRunnable = new FadeRunnable();
+
+        mFrameTimings = new int[60];
+        mCurrentFrame = mFrameTimingsSum = mDroppedFrames = 0;
+        mShowFrameRate = false;
+
+        // Initialize the FloatBuffer that will be used to store all vertices and texture
+        // coordinates in draw() commands.
+        ByteBuffer byteBuffer = LOKitShell.allocateDirectBuffer(COORD_BUFFER_SIZE * 4);
+        byteBuffer.order(ByteOrder.nativeOrder());
+        mCoordBuffer = byteBuffer.asFloatBuffer();
+    }
+
+    public void onSurfaceCreated(GL10 gl, EGLConfig config) {
+        checkMonitoringEnabled();
+        createProgram();
+        activateProgram();
+    }
+
+    public void createProgram() {
+        int vertexShader = loadShader(GLES20.GL_VERTEX_SHADER, VERTEX_SHADER);
+        int fragmentShader = loadShader(GLES20.GL_FRAGMENT_SHADER, FRAGMENT_SHADER);
+
+        mProgram = GLES20.glCreateProgram();
+        GLES20.glAttachShader(mProgram, vertexShader);   // add the vertex shader to program
+        GLES20.glAttachShader(mProgram, fragmentShader); // add the fragment shader to program
+        GLES20.glLinkProgram(mProgram);                  // creates OpenGL program executables
+
+        // Get handles to the vertex shader's vPosition, aTexCoord, sTexture, and uTMatrix members.
+        mPositionHandle = GLES20.glGetAttribLocation(mProgram, "vPosition");
+        mTextureHandle = GLES20.glGetAttribLocation(mProgram, "aTexCoord");
+        mSampleHandle = GLES20.glGetUniformLocation(mProgram, "sTexture");
+        mTMatrixHandle = GLES20.glGetUniformLocation(mProgram, "uTMatrix");
+
+        int maxTextureSizeResult[] = new int[1];
+        GLES20.glGetIntegerv(GLES20.GL_MAX_TEXTURE_SIZE, maxTextureSizeResult, 0);
+        mMaxTextureSize = maxTextureSizeResult[0];
+    }
+
+    // Activates the shader program.
+    public void activateProgram() {
+        // Add the program to the OpenGL environment
+        GLES20.glUseProgram(mProgram);
+
+        // Set the transformation matrix
+        GLES20.glUniformMatrix4fv(mTMatrixHandle, 1, false, TEXTURE_MATRIX, 0);
+
+        Log.e(LOGTAG, "### Position handle is " + mPositionHandle + ", texture handle is " +
+                mTextureHandle + ", last error is " + GLES20.glGetError());
+
+        // Enable the arrays from which we get the vertex and texture coordinates
+        GLES20.glEnableVertexAttribArray(mPositionHandle);
+        GLES20.glEnableVertexAttribArray(mTextureHandle);
+
+        GLES20.glUniform1i(mSampleHandle, 0);
+
+        TextureGenerator.get().fill();
+
+        // TODO: Move these calls into a separate deactivate() call that is called after the
+        // underlay and overlay are rendered.
+    }
+
+    // Deactivates the shader program. This must be done to avoid crashes after returning to the
+    // Gecko C++ compositor from Java.
+    public void deactivateProgram() {
+        GLES20.glDisableVertexAttribArray(mTextureHandle);
+        GLES20.glDisableVertexAttribArray(mPositionHandle);
+        GLES20.glUseProgram(0);
+    }
+
+    public int getMaxTextureSize() {
+        return mMaxTextureSize;
+    }
+
+    public void addLayer(Layer layer) {
+        LayerController controller = mView.getController();
+
+        synchronized (controller) {
+            if (mExtraLayers.contains(layer)) {
+                mExtraLayers.remove(layer);
+            }
+
+            mExtraLayers.add(layer);
+        }
+    }
+
+    public void removeLayer(Layer layer) {
+        LayerController controller = mView.getController();
+
+        synchronized (controller) {
+            mExtraLayers.remove(layer);
+        }
+    }
+
+    /**
+     * Called whenever a new frame is about to be drawn.
+     */
+    public void onDrawFrame(GL10 gl) {
+        RenderContext pageContext = createPageContext(), screenContext = createScreenContext();
+        Frame frame = createFrame(pageContext, screenContext);
+        synchronized (mView.getController()) {
+            frame.beginDrawing();
+            frame.drawBackground();
+            frame.drawRootLayer();
+            frame.drawForeground();
+            frame.endDrawing();
+        }
+    }
+
+    private void printCheckerboardStats() {
+        Log.d(PROFTAG, "Frames rendered over last 1000ms: " + mCompleteFramesRendered + "/" + mFramesRendered);
+        mFramesRendered = 0;
+        mCompleteFramesRendered = 0;
+    }
+
+    /** Used by robocop for testing purposes. Not for production use! */
+    IntBuffer getPixels() {
+        IntBuffer pixelBuffer = IntBuffer.allocate(mView.getWidth() * mView.getHeight());
+        synchronized (pixelBuffer) {
+            mPixelBuffer = pixelBuffer;
+            mView.requestRender();
+            try {
+                pixelBuffer.wait();
+            } catch (InterruptedException ie) {
+            }
+            mPixelBuffer = null;
+        }
+        return pixelBuffer;
+    }
+
+    public RenderContext createScreenContext() {
+        LayerController layerController = mView.getController();
+        IntSize viewportSize = new IntSize(layerController.getViewportSize());
+        RectF viewport = new RectF(0.0f, 0.0f, viewportSize.width, viewportSize.height);
+        FloatSize pageSize = new FloatSize(layerController.getPageSize());
+        return createContext(viewport, pageSize, 1.0f);
+    }
+
+    public RenderContext createPageContext() {
+        LayerController layerController = mView.getController();
+
+        Rect viewport = new Rect();
+        layerController.getViewport().round(viewport);
+
+        FloatSize pageSize = new FloatSize(layerController.getPageSize());
+        float zoomFactor = layerController.getZoomFactor();
+        return createContext(new RectF(viewport), pageSize, zoomFactor);
+    }
+
+    private RenderContext createContext(RectF viewport, FloatSize pageSize, float zoomFactor) {
+        return new RenderContext(viewport, pageSize, zoomFactor, mPositionHandle, mTextureHandle,
+                mCoordBuffer);
+    }
+
+    private Rect getPageRect() {
+        LayerController controller = mView.getController();
+
+        Point origin = PointUtils.round(controller.getOrigin());
+        IntSize pageSize = new IntSize(controller.getPageSize());
+
+        origin.negate();
+
+        return new Rect(origin.x, origin.y,
+                origin.x + pageSize.width, origin.y + pageSize.height);
+    }
+
+    private Rect transformToScissorRect(Rect rect) {
+        LayerController controller = mView.getController();
+        IntSize screenSize = new IntSize(controller.getViewportSize());
+
+        int left = Math.max(0, rect.left);
+        int top = Math.max(0, rect.top);
+        int right = Math.min(screenSize.width, rect.right);
+        int bottom = Math.min(screenSize.height, rect.bottom);
+
+        return new Rect(left, screenSize.height - bottom, right,
+                (screenSize.height - bottom) + (bottom - top));
+    }
+
+    public void onSurfaceChanged(GL10 gl, final int width, final int height) {
+        GLES20.glViewport(0, 0, width, height);
+
+        // updating the state in the view/controller/client should be
+        // done on the main UI thread, not the GL renderer thread
+        mView.post(new Runnable() {
+            public void run() {
+                mView.setViewportSize(new IntSize(width, height));
+                moveFrameRateLayer(width, height);
+            }
+        });
+
+        /* TODO: Throw away tile images? */
+    }
+
+    private void updateDroppedFrames(long frameStartTime) {
+        int frameElapsedTime = (int)(SystemClock.uptimeMillis() - frameStartTime);
+
+        /* Update the running statistics. */
+        mFrameTimingsSum -= mFrameTimings[mCurrentFrame];
+        mFrameTimingsSum += frameElapsedTime;
+        mDroppedFrames -= (mFrameTimings[mCurrentFrame] + 1) / MAX_FRAME_TIME;
+        mDroppedFrames += (frameElapsedTime + 1) / MAX_FRAME_TIME;
+
+        mFrameTimings[mCurrentFrame] = frameElapsedTime;
+        mCurrentFrame = (mCurrentFrame + 1) % mFrameTimings.length;
+
+        int averageTime = mFrameTimingsSum / mFrameTimings.length;
+        mFrameRateLayer.beginTransaction();
+        try {
+            mFrameRateLayer.setText(averageTime + " ms/" + mDroppedFrames);
+        } finally {
+            mFrameRateLayer.endTransaction();
+        }
+    }
+
+    /* Given the new dimensions for the surface, moves the frame rate layer appropriately. */
+    private void moveFrameRateLayer(int width, int height) {
+        mFrameRateLayer.beginTransaction();
+        try {
+            Point origin = new Point(width - FRAME_RATE_METER_WIDTH - 8,
+                    height - FRAME_RATE_METER_HEIGHT + 8);
+            mFrameRateLayer.setOrigin(origin);
+        } finally {
+            mFrameRateLayer.endTransaction();
+        }
+    }
+
+    private void checkMonitoringEnabled() {
+        /* Do this I/O off the main thread to minimize its impact on startup time. */
+        new Thread(new Runnable() {
+            @Override
+            public void run() {
+                Context context = mView.getContext();
+                SharedPreferences preferences = context.getSharedPreferences("GeckoApp", 0);
+                mShowFrameRate = preferences.getBoolean("showFrameRate", false);
+                mProfileRender = Log.isLoggable(PROFTAG, Log.DEBUG);
+            }
+        }).start();
+    }
+
+    private void updateCheckerboardLayer(RenderContext renderContext) {
+        int checkerboardColor = mView.getController().getCheckerboardColor();
+        boolean showChecks = mView.getController().checkerboardShouldShowChecks();
+        if (checkerboardColor == mCheckerboardImage.getColor() &&
+                showChecks == mCheckerboardImage.getShowChecks()) {
+            return;
+        }
+
+        mCheckerboardLayer.beginTransaction();
+        try {
+            mCheckerboardImage.update(showChecks, checkerboardColor);
+            mCheckerboardLayer.invalidate();
+        } finally {
+            mCheckerboardLayer.endTransaction();
+        }
+
+        mCheckerboardLayer.update(renderContext);
+    }
+
+    /*
+     * create a vertex shader type (GLES20.GL_VERTEX_SHADER)
+     * or a fragment shader type (GLES20.GL_FRAGMENT_SHADER)
+     */
+    private int loadShader(int type, String shaderCode) {
+        int shader = GLES20.glCreateShader(type);
+        GLES20.glShaderSource(shader, shaderCode);
+        GLES20.glCompileShader(shader);
+        return shader;
+    }
+
+    public Frame createFrame(RenderContext pageContext, RenderContext screenContext) {
+        return new Frame(pageContext, screenContext);
+    }
+
+    class FadeRunnable implements Runnable {
+        private boolean mStarted;
+        private long mRunAt;
+
+        void scheduleStartFade(long delay) {
+            mRunAt = SystemClock.elapsedRealtime() + delay;
+            if (!mStarted) {
+                mView.postDelayed(this, delay);
+                mStarted = true;
+            }
+        }
+
+        void scheduleNextFadeFrame() {
+            if (mStarted) {
+                Log.e(LOGTAG, "scheduleNextFadeFrame() called while scheduled for starting fade");
+            }
+            mView.postDelayed(this, 1000L / 60L); // request another frame at 60fps
+        }
+
+        boolean timeToFade() {
+            return !mStarted;
+        }
+
+        public void run() {
+            long timeDelta = mRunAt - SystemClock.elapsedRealtime();
+            if (timeDelta > 0) {
+                // the run-at time was pushed back, so reschedule
+                mView.postDelayed(this, timeDelta);
+            } else {
+                // reached the run-at time, execute
+                mStarted = false;
+                mView.requestRender();
+            }
+        }
+    }
+
+    public class Frame {
+        // The timestamp recording the start of this frame.
+        private long mFrameStartTime;
+        // A rendering context for page-positioned layers, and one for screen-positioned layers.
+        private RenderContext mPageContext, mScreenContext;
+        // Whether a layer was updated.
+        private boolean mUpdated;
+
+        public Frame(RenderContext pageContext, RenderContext screenContext) {
+            mPageContext = pageContext;
+            mScreenContext = screenContext;
+        }
+
+        private void setScissorRect() {
+            Rect scissorRect = transformToScissorRect(getPageRect());
+            GLES20.glEnable(GLES20.GL_SCISSOR_TEST);
+            GLES20.glScissor(scissorRect.left, scissorRect.top,
+                    scissorRect.width(), scissorRect.height());
+        }
+
+        public void beginDrawing() {
+            mFrameStartTime = SystemClock.uptimeMillis();
+
+            TextureReaper.get().reap();
+            TextureGenerator.get().fill();
+
+            mUpdated = true;
+
+            LayerController controller = mView.getController();
+            Layer rootLayer = controller.getRoot();
+
+            if (!mPageContext.fuzzyEquals(mLastPageContext)) {
+                // the viewport or page changed, so show the scrollbars again
+                // as per UX decision
+                mVertScrollLayer.unfade();
+                mHorizScrollLayer.unfade();
+                mFadeRunnable.scheduleStartFade(ScrollbarLayer.FADE_DELAY);
+            } else if (mFadeRunnable.timeToFade()) {
+                boolean stillFading = mVertScrollLayer.fade() | mHorizScrollLayer.fade();
+                if (stillFading) {
+                    mFadeRunnable.scheduleNextFadeFrame();
+                }
+            }
+            mLastPageContext = mPageContext;
+
+            /* Update layers. */
+            if (rootLayer != null) mUpdated &= rootLayer.update(mPageContext);
+            mUpdated &= mBackgroundLayer.update(mScreenContext);
+            mUpdated &= mShadowLayer.update(mPageContext);
+            updateCheckerboardLayer(mScreenContext);
+            mUpdated &= mFrameRateLayer.update(mScreenContext);
+            mUpdated &= mVertScrollLayer.update(mPageContext);
+            mUpdated &= mHorizScrollLayer.update(mPageContext);
+
+            for (Layer layer : mExtraLayers)
+                mUpdated &= layer.update(mPageContext);
+
+            GLES20.glDisable(GLES20.GL_SCISSOR_TEST);
+
+            // If a layer update requires further work, schedule another redraw
+            if (!mUpdated)
+                mView.requestRender();
+
+            PanningPerfAPI.recordFrameTime();
+
+            /* Used by robocop for testing purposes */
+            IntBuffer pixelBuffer = mPixelBuffer;
+            if (mUpdated && pixelBuffer != null) {
+                synchronized (pixelBuffer) {
+                    pixelBuffer.position(0);
+                    GLES20.glReadPixels(0, 0, (int)mScreenContext.viewport.width(),
+                            (int)mScreenContext.viewport.height(), GLES20.GL_RGBA,
+                            GLES20.GL_UNSIGNED_BYTE, pixelBuffer);
+                    pixelBuffer.notify();
+                }
+            }
+        }
+
+        public void drawBackground() {
+            /* Draw the background. */
+            mBackgroundLayer.draw(mScreenContext);
+
+            /* Draw the drop shadow, if we need to. */
+            Rect pageRect = getPageRect();
+            RectF untransformedPageRect = new RectF(0.0f, 0.0f, pageRect.width(),
+                    pageRect.height());
+            if (!untransformedPageRect.contains(mView.getController().getViewport()))
+                mShadowLayer.draw(mPageContext);
+
+            /* Draw the checkerboard. */
+            setScissorRect();
+            mCheckerboardLayer.draw(mScreenContext);
+            GLES20.glDisable(GLES20.GL_SCISSOR_TEST);
+        }
+
+        // Draws the layer the client added to us.
+        void drawRootLayer() {
+            Layer rootLayer = mView.getController().getRoot();
+            if (rootLayer == null) {
+                return;
+            }
+
+            setScissorRect();
+            rootLayer.draw(mPageContext);
+            GLES20.glDisable(GLES20.GL_SCISSOR_TEST);
+        }
+
+        public void drawForeground() {
+            Rect pageRect = getPageRect();
+            LayerController controller = mView.getController();
+
+            /* Draw any extra layers that were added (likely plugins) */
+            for (Layer layer : mExtraLayers)
+                layer.draw(mPageContext);
+
+            /* Draw the vertical scrollbar. */
+            IntSize screenSize = new IntSize(controller.getViewportSize());
+            if (pageRect.height() > screenSize.height)
+                mVertScrollLayer.draw(mPageContext);
+
+            /* Draw the horizontal scrollbar. */
+            if (pageRect.width() > screenSize.width)
+                mHorizScrollLayer.draw(mPageContext);
+
+            /* Measure how much of the screen is checkerboarding */
+            Layer rootLayer = controller.getRoot();
+            if ((rootLayer != null) &&
+                    (mProfileRender || PanningPerfAPI.isRecordingCheckerboard())) {
+                // Find out how much of the viewport area is valid
+                Rect viewport = RectUtils.round(mPageContext.viewport);
+                Region validRegion = rootLayer.getValidRegion(mPageContext);
+                validRegion.op(viewport, Region.Op.INTERSECT);
+
+                float checkerboard = 0.0f;
+                if (!(validRegion.isRect() && validRegion.getBounds().equals(viewport))) {
+                    int screenArea = viewport.width() * viewport.height();
+                    validRegion.op(viewport, Region.Op.REVERSE_DIFFERENCE);
+
+                    // XXX The assumption here is that a Region never has overlapping
+                    //     rects. This is true, as evidenced by reading the SkRegion
+                    //     source, but is not mentioned in the Android documentation,
+                    //     and so is liable to change.
+                    //     If it does change, this code will need to be reevaluated.
+                    Rect r = new Rect();
+                    int checkerboardArea = 0;
+                    for (RegionIterator i = new RegionIterator(validRegion); i.next(r);) {
+                        checkerboardArea += r.width() * r.height();
+                    }
+
+                    checkerboard = checkerboardArea / (float)screenArea;
+                }
+
+                PanningPerfAPI.recordCheckerboard(checkerboard);
+
+                mCompleteFramesRendered += 1.0f - checkerboard;
+                mFramesRendered ++;
+
+                if (mFrameStartTime - mProfileOutputTime > 1000) {
+                    mProfileOutputTime = mFrameStartTime;
+                    printCheckerboardStats();
+                }
+            }
+
+            /* Draw the FPS. */
+            if (mShowFrameRate) {
+                updateDroppedFrames(mFrameStartTime);
+
+                try {
+                    GLES20.glEnable(GLES20.GL_BLEND);
+                    GLES20.glBlendFunc(GLES20.GL_SRC_ALPHA, GLES20.GL_ONE_MINUS_SRC_ALPHA);
+                    mFrameRateLayer.draw(mScreenContext);
+                } finally {
+                    GLES20.glDisable(GLES20.GL_BLEND);
+                }
+            }
+        }
+
+        public void endDrawing() {
+            // If a layer update requires further work, schedule another redraw
+            if (!mUpdated)
+                mView.requestRender();
+
+            PanningPerfAPI.recordFrameTime();
+
+            /* Used by robocop for testing purposes */
+            IntBuffer pixelBuffer = mPixelBuffer;
+            if (mUpdated && pixelBuffer != null) {
+                synchronized (pixelBuffer) {
+                    pixelBuffer.position(0);
+                    GLES20.glReadPixels(0, 0, (int)mScreenContext.viewport.width(),
+                            (int)mScreenContext.viewport.height(), GLES20.GL_RGBA,
+                            GLES20.GL_UNSIGNED_BYTE, pixelBuffer);
+                    pixelBuffer.notify();
+                }
+            }
+        }
+    }
+}
diff --git a/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/LayerView.java b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/LayerView.java
new file mode 100644
index 000000000000..a3c04fa600f2
--- /dev/null
+++ b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/LayerView.java
@@ -0,0 +1,230 @@
+/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
+ * ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Mozilla Android code.
+ *
+ * The Initial Developer of the Original Code is Mozilla Foundation.
+ * Portions created by the Initial Developer are Copyright (C) 2009-2010
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Patrick Walton <pcwalton@mozilla.com>
+ *   Arkady Blyakher <rkadyb@mit.edu>
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+package org.mozilla.gecko.gfx;
+
+//import org.mozilla.gecko.GeckoInputConnection;
+import org.mozilla.gecko.gfx.FloatSize;
+import org.mozilla.gecko.gfx.InputConnectionHandler;
+import org.mozilla.gecko.gfx.LayerController;
+import org.mozilla.gecko.ui.SimpleScaleGestureDetector;
+import android.content.Context;
+import android.opengl.GLSurfaceView;
+import android.view.View;
+import android.view.GestureDetector;
+import android.view.KeyEvent;
+import android.view.MotionEvent;
+import android.view.inputmethod.EditorInfo;
+import android.view.inputmethod.InputConnection;
+import android.view.ScaleGestureDetector;
+import android.widget.RelativeLayout;
+import android.util.Log;
+import java.nio.IntBuffer;
+import java.util.LinkedList;
+
+/**
+ * A view rendered by the layer compositor.
+ *
+ * This view delegates to LayerRenderer to actually do the drawing. Its role is largely that of a
+ * mediator between the LayerRenderer and the LayerController.
+ */
+public class LayerView extends FlexibleGLSurfaceView {
+    private Context mContext;
+    private LayerController mController;
+    private InputConnectionHandler mInputConnectionHandler;
+    private LayerRenderer mRenderer;
+    private GestureDetector mGestureDetector;
+    private SimpleScaleGestureDetector mScaleGestureDetector;
+    private long mRenderTime;
+    private boolean mRenderTimeReset;
+    private static String LOGTAG = "GeckoLayerView";
+    /* List of events to be processed if the page does not prevent them. Should only be touched on the main thread */
+    private LinkedList<MotionEvent> mEventQueue = new LinkedList<MotionEvent>();
+
+
+    public LayerView(Context context, LayerController controller) {
+        super(context);
+
+        mContext = context;
+        mController = controller;
+        mRenderer = new LayerRenderer(this);
+        setRenderer(mRenderer);
+        mGestureDetector = new GestureDetector(context, controller.getGestureListener());
+        mScaleGestureDetector =
+                new SimpleScaleGestureDetector(controller.getScaleGestureListener());
+        mGestureDetector.setOnDoubleTapListener(controller.getDoubleTapListener());
+        mInputConnectionHandler = null;
+
+        setFocusable(true);
+        setFocusableInTouchMode(true);
+
+        createGLThread();
+    }
+
+    private void addToEventQueue(MotionEvent event) {
+        MotionEvent copy = MotionEvent.obtain(event);
+        mEventQueue.add(copy);
+    }
+
+    public void processEventQueue() {
+        MotionEvent event = mEventQueue.poll();
+        while(event != null) {
+            processEvent(event);
+            event = mEventQueue.poll();
+        }
+    }
+
+    public void clearEventQueue() {
+        mEventQueue.clear();
+    }
+
+    @Override
+    public boolean onTouchEvent(MotionEvent event) {
+        if (mController.onTouchEvent(event)) {
+            addToEventQueue(event);
+            return true;
+        }
+        return processEvent(event);
+    }
+
+    private boolean processEvent(MotionEvent event) {
+        if (mGestureDetector.onTouchEvent(event))
+            return true;
+        mScaleGestureDetector.onTouchEvent(event);
+        if (mScaleGestureDetector.isInProgress())
+            return true;
+        mController.getPanZoomController().onTouchEvent(event);
+        return true;
+    }
+
+    public LayerController getController() { return mController; }
+
+    /** The LayerRenderer calls this to indicate that the window has changed size. */
+    public void setViewportSize(IntSize size) {
+        mController.setViewportSize(new FloatSize(size));
+    }
+
+    //public GeckoInputConnection setInputConnectionHandler() {
+    //    GeckoInputConnection geckoInputConnection = GeckoInputConnection.create(this);
+    //    mInputConnectionHandler = geckoInputConnection;
+    //    return geckoInputConnection;
+    //}
+
+    @Override
+    public InputConnection onCreateInputConnection(EditorInfo outAttrs) {
+        if (mInputConnectionHandler != null)
+            return mInputConnectionHandler.onCreateInputConnection(outAttrs);
+        return null;
+    }
+
+    @Override
+    public boolean onKeyPreIme(int keyCode, KeyEvent event) {
+        if (mInputConnectionHandler != null)
+            return mInputConnectionHandler.onKeyPreIme(keyCode, event);
+        return false;
+    }
+
+    @Override
+    public boolean onKeyDown(int keyCode, KeyEvent event) {
+        if (mInputConnectionHandler != null)
+            return mInputConnectionHandler.onKeyDown(keyCode, event);
+        return false;
+    }
+
+    @Override
+    public boolean onKeyLongPress(int keyCode, KeyEvent event) {
+        if (mInputConnectionHandler != null)
+            return mInputConnectionHandler.onKeyLongPress(keyCode, event);
+        return false;
+    }
+
+    @Override
+    public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) {
+        if (mInputConnectionHandler != null)
+            return mInputConnectionHandler.onKeyMultiple(keyCode, repeatCount, event);
+        return false;
+    }
+
+    @Override
+    public boolean onKeyUp(int keyCode, KeyEvent event) {
+        if (mInputConnectionHandler != null)
+            return mInputConnectionHandler.onKeyUp(keyCode, event);
+        return false;
+    }
+
+    @Override
+    public void requestRender() {
+        super.requestRender();
+
+        synchronized(this) {
+            if (!mRenderTimeReset) {
+                mRenderTimeReset = true;
+                mRenderTime = System.nanoTime();
+            }
+        }
+    }
+
+    public void addLayer(Layer layer) {
+        mRenderer.addLayer(layer);
+    }
+
+    public void removeLayer(Layer layer) {
+        mRenderer.removeLayer(layer);
+    }
+
+    /**
+     * Returns the time elapsed between the first call of requestRender() after
+     * the last call of getRenderTime(), in nanoseconds.
+     */
+    public long getRenderTime() {
+        synchronized(this) {
+            mRenderTimeReset = false;
+            return System.nanoTime() - mRenderTime;
+        }
+    }
+
+    public int getMaxTextureSize() {
+        return mRenderer.getMaxTextureSize();
+    }
+
+    /** Used by robocop for testing purposes. Not for production use! This is called via reflection by robocop. */
+    public IntBuffer getPixels() {
+        return mRenderer.getPixels();
+    }
+}
+
diff --git a/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/MultiTileLayer.java b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/MultiTileLayer.java
new file mode 100644
index 000000000000..3514b4207461
--- /dev/null
+++ b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/MultiTileLayer.java
@@ -0,0 +1,300 @@
+/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
+* ***** BEGIN LICENSE BLOCK *****
+* Version: MPL 1.1/GPL 2.0/LGPL 2.1
+*
+* The contents of this file are subject to the Mozilla Public License Version
+* 1.1 (the "License"); you may not use this file except in compliance with
+* the License. You may obtain a copy of the License at
+* http://www.mozilla.org/MPL/
+*
+* Software distributed under the License is distributed on an "AS IS" basis,
+* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+* for the specific language governing rights and limitations under the
+* License.
+*
+* The Original Code is Mozilla Android code.
+*
+* The Initial Developer of the Original Code is Mozilla Foundation.
+* Portions created by the Initial Developer are Copyright (C) 2011-2012
+* the Initial Developer. All Rights Reserved.
+*
+* Contributor(s):
+*   Chris Lord <chrislord.net@gmail.com>
+*   Arkady Blyakher <rkadyb@mit.edu>
+*
+* Alternatively, the contents of this file may be used under the terms of
+* either the GNU General Public License Version 2 or later (the "GPL"), or
+* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+* in which case the provisions of the GPL or the LGPL are applicable instead
+* of those above. If you wish to allow use of your version of this file only
+* under the terms of either the GPL or the LGPL, and not to allow others to
+* use your version of this file under the terms of the MPL, indicate your
+* decision by deleting the provisions above and replace them with the notice
+* and other provisions required by the GPL or the LGPL. If you do not delete
+* the provisions above, a recipient may use your version of this file under
+* the terms of any one of the MPL, the GPL or the LGPL.
+*
+* ***** END LICENSE BLOCK ***** */
+
+package org.mozilla.gecko.gfx;
+
+import android.graphics.Point;
+import android.graphics.Rect;
+import android.graphics.RectF;
+import android.graphics.Region;
+
+import java.nio.ByteBuffer;
+import java.util.ArrayList;
+
+/**
+ * Encapsulates the logic needed to draw a layer made of multiple tiles.
+ * <p/>
+ * TODO: Support repeating.
+ */
+public class MultiTileLayer extends Layer {
+    private static final String LOGTAG = "GeckoMultiTileLayer";
+
+    private final CairoImage mImage;
+    private final ArrayList<SubTile> mTiles;
+    private IntSize mTileSize;
+    private IntSize mBufferSize;
+
+    public MultiTileLayer(CairoImage image, IntSize tileSize) {
+        super();
+
+        mImage = image;
+        mTileSize = tileSize;
+        mBufferSize = new IntSize(0, 0);
+        mTiles = new ArrayList<SubTile>();
+    }
+
+    public void invalidate(Rect dirtyRect) {
+        if (!inTransaction()) {
+            throw new RuntimeException("invalidate() is only valid inside a transaction");
+        }
+
+        for (SubTile layer : mTiles) {
+            IntSize tileSize = layer.getSize();
+            Rect tileRect = new Rect(layer.x, layer.y, layer.x + tileSize.width, layer.y + tileSize.height);
+
+            if (tileRect.intersect(dirtyRect)) {
+                tileRect.offset(-layer.x, -layer.y);
+                layer.invalidate(tileRect);
+            }
+        }
+    }
+
+    public void invalidate() {
+        for (SubTile layer : mTiles) {
+            layer.invalidate();
+        }
+    }
+
+    @Override
+    public IntSize getSize() {
+        return mImage.getSize();
+    }
+
+    private void validateTiles() {
+        IntSize size = getSize();
+
+        if (size.equals(mBufferSize)) {
+            return;
+        }
+
+        // Regenerate tiles
+        mTiles.clear();
+        int offset = 0;
+        final int format = mImage.getFormat();
+        final ByteBuffer buffer = mImage.getBuffer().slice();
+        final int bpp = CairoUtils.bitsPerPixelForCairoFormat(format) / 8;
+        for (int y = 0; y < size.height; y += mTileSize.height) {
+            for (int x = 0; x < size.width; x += mTileSize.width) {
+                // Create a CairoImage implementation that returns a
+                // tile from the parent CairoImage. It's assumed that
+                // the tiles are stored in series.
+                final IntSize layerSize =
+                        new IntSize(Math.min(mTileSize.width, size.width - x),
+                                Math.min(mTileSize.height, size.height - y));
+                final int tileOffset = offset;
+
+                CairoImage subImage = new CairoImage() {
+                    @Override
+                    public ByteBuffer getBuffer() {
+                        // Create a ByteBuffer that shares the data of the original
+                        // buffer, but is positioned and limited so that only the
+                        // tile data is accessible.
+                        buffer.position(tileOffset);
+                        ByteBuffer tileBuffer = buffer.slice();
+                        tileBuffer.limit(layerSize.getArea() * bpp);
+
+                        return tileBuffer;
+                    }
+
+                    @Override
+                    public IntSize getSize() {
+                        return layerSize;
+                    }
+
+                    @Override
+                    public int getFormat() {
+                        return format;
+                    }
+                };
+
+                mTiles.add(new SubTile(subImage, x, y));
+                offset += layerSize.getArea() * bpp;
+            }
+        }
+
+        // Set tile origins and resolution
+        refreshTileMetrics(getOrigin(), getResolution(), false);
+
+        mBufferSize = size;
+    }
+
+    @Override
+    protected boolean performUpdates(RenderContext context) {
+        super.performUpdates(context);
+
+        validateTiles();
+
+        // Iterate over the tiles and decide which ones we'll be drawing
+        int dirtyTiles = 0;
+        boolean screenUpdateDone = false;
+        SubTile firstDirtyTile = null;
+        for (SubTile layer : mTiles) {
+            // First do a non-texture update to make sure coordinates are
+            // up-to-date.
+            boolean invalid = layer.getSkipTextureUpdate();
+            layer.setSkipTextureUpdate(true);
+            layer.performUpdates(context);
+
+            RectF layerBounds = layer.getBounds(context, new FloatSize(layer.getSize()));
+            boolean isDirty = layer.isDirty();
+
+            if (isDirty) {
+                if (!RectF.intersects(layerBounds, context.viewport)) {
+                    if (firstDirtyTile == null)
+                        firstDirtyTile = layer;
+                    dirtyTiles++;
+                    invalid = true;
+                } else {
+                    // This tile intersects with the screen and is dirty,
+                    // update it immediately.
+                    layer.setSkipTextureUpdate(false);
+                    screenUpdateDone = true;
+                    layer.performUpdates(context);
+                    invalid = false;
+                }
+            }
+
+            // We use the SkipTextureUpdate flag as a marker of a tile's
+            // validity. This is required, as sometimes layers are drawn
+            // without updating first, and we mustn't draw tiles that have
+            // been marked as invalid that we haven't updated.
+            layer.setSkipTextureUpdate(invalid);
+        }
+
+        // Now if no tiles that intersect with the screen were updated, update
+        // a single tile that doesn't (if there are any). This has the effect
+        // of spreading out non-critical texture upload over time, and smoothing
+        // upload-related hitches.
+        if (!screenUpdateDone && firstDirtyTile != null) {
+            firstDirtyTile.setSkipTextureUpdate(false);
+            firstDirtyTile.performUpdates(context);
+            dirtyTiles--;
+        }
+
+        return (dirtyTiles == 0);
+    }
+
+    private void refreshTileMetrics(Point origin, float resolution, boolean inTransaction) {
+        IntSize size = getSize();
+        for (SubTile layer : mTiles) {
+            if (!inTransaction) {
+                layer.beginTransaction();
+            }
+
+            if (origin != null) {
+                layer.setOrigin(new Point(origin.x + layer.x, origin.y + layer.y));
+            }
+            if (resolution >= 0.0f) {
+                layer.setResolution(resolution);
+            }
+
+            if (!inTransaction) {
+                layer.endTransaction();
+            }
+        }
+    }
+
+    @Override
+    public void setOrigin(Point newOrigin) {
+        super.setOrigin(newOrigin);
+        refreshTileMetrics(newOrigin, -1, true);
+    }
+
+    @Override
+    public void setResolution(float newResolution) {
+        super.setResolution(newResolution);
+        refreshTileMetrics(null, newResolution, true);
+    }
+
+    @Override
+    public void beginTransaction() {
+        super.beginTransaction();
+
+        for (SubTile layer : mTiles) {
+            layer.beginTransaction();
+        }
+    }
+
+    @Override
+    public void endTransaction() {
+        for (SubTile layer : mTiles) {
+            layer.endTransaction();
+        }
+
+        super.endTransaction();
+    }
+
+    @Override
+    public void draw(RenderContext context) {
+        for (SubTile layer : mTiles) {
+            // We use the SkipTextureUpdate flag as a validity flag. If it's false,
+            // the contents of this tile are invalid and we shouldn't draw it.
+            if (layer.getSkipTextureUpdate())
+                continue;
+
+            // Avoid work, only draw tiles that intersect with the viewport
+            RectF layerBounds = layer.getBounds(context, new FloatSize(layer.getSize()));
+            if (RectF.intersects(layerBounds, context.viewport))
+                layer.draw(context);
+        }
+    }
+
+    @Override
+    public Region getValidRegion(RenderContext context) {
+        Region validRegion = new Region();
+        for (SubTile tile : mTiles) {
+            if (tile.getSkipTextureUpdate())
+                continue;
+            validRegion.op(tile.getValidRegion(context), Region.Op.UNION);
+        }
+
+        return validRegion;
+    }
+
+    class SubTile extends SingleTileLayer {
+        public int x;
+        public int y;
+
+        public SubTile(CairoImage mImage, int mX, int mY) {
+            super(mImage);
+            x = mX;
+            y = mY;
+        }
+    }
+}
+
diff --git a/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/NinePatchTileLayer.java b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/NinePatchTileLayer.java
new file mode 100644
index 000000000000..f139b202c7b5
--- /dev/null
+++ b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/NinePatchTileLayer.java
@@ -0,0 +1,124 @@
+/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
+ * ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Mozilla Android code.
+ *
+ * The Initial Developer of the Original Code is Mozilla Foundation.
+ * Portions created by the Initial Developer are Copyright (C) 2009-2010
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Patrick Walton <pcwalton@mozilla.com>
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+package org.mozilla.gecko.gfx;
+
+import org.mozilla.gecko.gfx.FloatSize;
+import android.graphics.PointF;
+import android.graphics.RectF;
+import android.opengl.GLES11;
+import android.opengl.GLES11Ext;
+import android.util.Log;
+import javax.microedition.khronos.opengles.GL10;
+import java.nio.FloatBuffer;
+
+/**
+ * Encapsulates the logic needed to draw a nine-patch bitmap using OpenGL ES.
+ *
+ * For more information on nine-patch bitmaps, see the following document:
+ *   http://developer.android.com/guide/topics/graphics/2d-graphics.html#nine-patch
+ */
+public class NinePatchTileLayer extends TileLayer {
+    private static final int PATCH_SIZE = 16;
+    private static final int TEXTURE_SIZE = 48;
+
+    public NinePatchTileLayer(CairoImage image) {
+        super(false, image);
+    }
+
+    @Override
+    public void draw(RenderContext context) {
+        if (!initialized())
+            return;
+
+        GLES11.glBlendFunc(GL10.GL_SRC_ALPHA, GL10.GL_ONE_MINUS_SRC_ALPHA);
+        GLES11.glEnable(GL10.GL_BLEND);
+        try {
+            GLES11.glBindTexture(GL10.GL_TEXTURE_2D, getTextureID());
+            drawPatches(context);
+        } finally {
+            GLES11.glDisable(GL10.GL_BLEND);
+        }
+    }
+
+    private void drawPatches(RenderContext context) {
+        /*
+         * We divide the nine-patch bitmap up as follows:
+         *
+         *    +---+---+---+
+         *    | 0 | 1 | 2 |
+         *    +---+---+---+
+         *    | 3 |   | 4 |
+         *    +---+---+---+
+         *    | 5 | 6 | 7 |
+         *    +---+---+---+
+         */
+
+        FloatSize size = context.pageSize;
+        float width = size.width, height = size.height;
+
+        drawPatch(context, 0, 0,                                                    /* 0 */
+                  0.0f, 0.0f, PATCH_SIZE, PATCH_SIZE);
+        drawPatch(context, PATCH_SIZE, 0,                                           /* 1 */
+                  PATCH_SIZE, 0.0f, width, PATCH_SIZE);
+        drawPatch(context, PATCH_SIZE * 2, 0,                                       /* 2 */
+                  PATCH_SIZE + width, 0.0f, PATCH_SIZE, PATCH_SIZE);
+        drawPatch(context, 0, PATCH_SIZE,                                           /* 3 */
+                  0.0f, PATCH_SIZE, PATCH_SIZE, height);
+        drawPatch(context, PATCH_SIZE * 2, PATCH_SIZE,                              /* 4 */
+                  PATCH_SIZE + width, PATCH_SIZE, PATCH_SIZE, height);
+        drawPatch(context, 0, PATCH_SIZE * 2,                                       /* 5 */
+                  0.0f, PATCH_SIZE + height, PATCH_SIZE, PATCH_SIZE);
+        drawPatch(context, PATCH_SIZE, PATCH_SIZE * 2,                              /* 6 */
+                  PATCH_SIZE, PATCH_SIZE + height, width, PATCH_SIZE);
+        drawPatch(context, PATCH_SIZE * 2, PATCH_SIZE * 2,                          /* 7 */
+                  PATCH_SIZE + width, PATCH_SIZE + height, PATCH_SIZE, PATCH_SIZE);
+    }
+
+    private void drawPatch(RenderContext context, int textureX, int textureY, float tileX,
+                           float tileY, float tileWidth, float tileHeight) {
+        int[] cropRect = { textureX, textureY + PATCH_SIZE, PATCH_SIZE, -PATCH_SIZE };
+        GLES11.glTexParameteriv(GL10.GL_TEXTURE_2D, GLES11Ext.GL_TEXTURE_CROP_RECT_OES, cropRect,
+                                0);
+
+        RectF viewport = context.viewport;
+        float viewportHeight = viewport.height();
+        float drawX = tileX - viewport.left - PATCH_SIZE;
+        float drawY = viewportHeight - (tileY + tileHeight - viewport.top - PATCH_SIZE);
+        GLES11Ext.glDrawTexfOES(drawX, drawY, 0.0f, tileWidth, tileHeight);
+    }
+}
diff --git a/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/PanningPerfAPI.java b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/PanningPerfAPI.java
new file mode 100644
index 000000000000..c9414ac8ecf0
--- /dev/null
+++ b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/PanningPerfAPI.java
@@ -0,0 +1,125 @@
+/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
+ * ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Mozilla Android code.
+ *
+ * The Initial Developer of the Original Code is Mozilla Foundation.
+ * Portions created by the Initial Developer are Copyright (C) 2011
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Kartikaya Gupta <kgupta@mozilla.com>
+ *   Chris Lord <chrislord.net@gmail.com>
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+package org.mozilla.gecko.gfx;
+
+import java.util.ArrayList;
+import java.util.List;
+import android.os.SystemClock;
+import android.util.Log;
+
+public class PanningPerfAPI {
+    private static final String LOGTAG = "GeckoPanningPerfAPI";
+
+    // make this large enough to avoid having to resize the frame time
+    // list, as that may be expensive and impact the thing we're trying
+    // to measure.
+    private static final int EXPECTED_FRAME_COUNT = 2048;
+
+    private static boolean mRecordingFrames = false;
+    private static List<Long> mFrameTimes;
+    private static long mFrameStartTime;
+
+    private static boolean mRecordingCheckerboard = false;
+    private static List<Float> mCheckerboardAmounts;
+    private static long mCheckerboardStartTime;
+
+    public static void startFrameTimeRecording() {
+        if (mRecordingFrames) {
+            Log.e(LOGTAG, "Error: startFrameTimeRecording() called while already recording!");
+            return;
+        }
+        mRecordingFrames = true;
+        if (mFrameTimes == null) {
+            mFrameTimes = new ArrayList<Long>(EXPECTED_FRAME_COUNT);
+        } else {
+            mFrameTimes.clear();
+        }
+        mFrameStartTime = SystemClock.uptimeMillis();
+    }
+
+    public static List<Long> stopFrameTimeRecording() {
+        if (!mRecordingFrames) {
+            Log.e(LOGTAG, "Error: stopFrameTimeRecording() called when not recording!");
+            return null;
+        }
+        mRecordingFrames = false;
+        return mFrameTimes;
+    }
+
+    public static void recordFrameTime() {
+        // this will be called often, so try to make it as quick as possible
+        if (mRecordingFrames) {
+            mFrameTimes.add(SystemClock.uptimeMillis() - mFrameStartTime);
+        }
+    }
+
+    public static boolean isRecordingCheckerboard() {
+        return mRecordingCheckerboard;
+    }
+
+    public static void startCheckerboardRecording() {
+        if (mRecordingCheckerboard) {
+            Log.e(LOGTAG, "Error: startCheckerboardRecording() called while already recording!");
+            return;
+        }
+        mRecordingCheckerboard = true;
+        if (mCheckerboardAmounts == null) {
+            mCheckerboardAmounts = new ArrayList<Float>(EXPECTED_FRAME_COUNT);
+        } else {
+            mCheckerboardAmounts.clear();
+        }
+        mCheckerboardStartTime = SystemClock.uptimeMillis();
+    }
+
+    public static List<Float> stopCheckerboardRecording() {
+        if (!mRecordingCheckerboard) {
+            Log.e(LOGTAG, "Error: stopCheckerboardRecording() called when not recording!");
+            return null;
+        }
+        mRecordingCheckerboard = false;
+        return mCheckerboardAmounts;
+    }
+
+    public static void recordCheckerboard(float amount) {
+        // this will be called often, so try to make it as quick as possible
+        if (mRecordingCheckerboard) {
+            mCheckerboardAmounts.add(amount);
+        }
+    }
+}
\ No newline at end of file
diff --git a/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/PointUtils.java b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/PointUtils.java
new file mode 100644
index 000000000000..bff9f9f345a1
--- /dev/null
+++ b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/PointUtils.java
@@ -0,0 +1,96 @@
+/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
+ * ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Mozilla Android code.
+ *
+ * The Initial Developer of the Original Code is Mozilla Foundation.
+ * Portions created by the Initial Developer are Copyright (C) 2011
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Kartikaya Gupta <kgupta@mozilla.com>
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+package org.mozilla.gecko.gfx;
+
+import android.graphics.Point;
+import android.graphics.PointF;
+import android.util.FloatMath;
+
+import org.json.JSONObject;
+import org.json.JSONException;
+import org.mozilla.gecko.util.FloatUtils;
+
+import java.lang.Math;
+
+public final class PointUtils {
+    public static PointF add(PointF one, PointF two) {
+        return new PointF(one.x + two.x, one.y + two.y);
+    }
+
+    public static PointF subtract(PointF one, PointF two) {
+        return new PointF(one.x - two.x, one.y - two.y);
+    }
+
+    public static PointF scale(PointF point, float factor) {
+        return new PointF(point.x * factor, point.y * factor);
+    }
+
+    public static Point round(PointF point) {
+        return new Point(Math.round(point.x), Math.round(point.y));
+    }
+
+   /* Returns a new point that is a linear interpolation between start and end points. weight conrols the weighting
+    * of each of the original points (weight = 1 returns endPoint, weight = 0 returns startPoint)
+    */
+   public static PointF interpolate(PointF startPoint, PointF endPoint, float weight) {
+       float x = FloatUtils.interpolate(startPoint.x, endPoint.x, weight);
+       float y = FloatUtils.interpolate(startPoint.y, endPoint.y, weight);
+       return new PointF(x, y);
+   }
+
+   /* Computes the magnitude of the given vector. */
+   public static float distance(PointF point) {
+        return (float)Math.sqrt(point.x * point.x + point.y * point.y);
+   }
+
+    /** Computes the scalar distance between two points. */
+    public static float distance(PointF one, PointF two) {
+        return PointF.length(one.x - two.x, one.y - two.y);
+    }
+
+    public static JSONObject toJSON(PointF point) throws JSONException {
+        // Ensure we put ints, not longs, because Gecko message handlers call getInt().
+        int x = Math.round(point.x);
+        int y = Math.round(point.y);
+        JSONObject json = new JSONObject();
+        json.put("x", x);
+        json.put("y", y);
+        return json;
+    }
+}
+
diff --git a/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/RectUtils.java b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/RectUtils.java
new file mode 100644
index 000000000000..9a5049781c45
--- /dev/null
+++ b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/RectUtils.java
@@ -0,0 +1,139 @@
+/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
+ * ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Mozilla Android code.
+ *
+ * The Initial Developer of the Original Code is Mozilla Foundation.
+ * Portions created by the Initial Developer are Copyright (C) 2011
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Kartikaya Gupta <kgupta@mozilla.com>
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+package org.mozilla.gecko.gfx;
+
+import org.mozilla.gecko.util.FloatUtils;
+import android.graphics.Point;
+import android.graphics.PointF;
+import android.graphics.Rect;
+import android.graphics.RectF;
+import org.json.JSONException;
+import org.json.JSONObject;
+
+public final class RectUtils {
+    public static Rect create(JSONObject json) {
+        try {
+            int x = json.getInt("x");
+            int y = json.getInt("y");
+            int width = json.getInt("width");
+            int height = json.getInt("height");
+            return new Rect(x, y, x + width, y + height);
+        } catch (JSONException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    public static Rect contract(Rect rect, int lessWidth, int lessHeight) {
+        float halfLessWidth = lessWidth / 2.0f;
+        float halfLessHeight = lessHeight / 2.0f;
+        return new Rect(Math.round(rect.left + halfLessWidth),
+                Math.round(rect.top + halfLessHeight),
+                Math.round(rect.right - halfLessWidth),
+                Math.round(rect.bottom - halfLessHeight));
+    }
+
+    public static RectF contract(RectF rect, float lessWidth, float lessHeight) {
+        float halfLessWidth = lessWidth / 2;
+        float halfLessHeight = lessHeight / 2;
+        return new RectF(rect.left + halfLessWidth,
+                rect.top + halfLessHeight,
+                rect.right - halfLessWidth,
+                rect.bottom - halfLessHeight);
+    }
+
+    public static RectF expand(RectF rect, float moreWidth, float moreHeight) {
+        float halfMoreWidth = moreWidth / 2;
+        float halfMoreHeight = moreHeight / 2;
+        return new RectF(rect.left - halfMoreWidth,
+                rect.top - halfMoreHeight,
+                rect.right + halfMoreWidth,
+                rect.bottom + halfMoreHeight);
+    }
+
+    public static RectF intersect(RectF one, RectF two) {
+        float left = Math.max(one.left, two.left);
+        float top = Math.max(one.top, two.top);
+        float right = Math.min(one.right, two.right);
+        float bottom = Math.min(one.bottom, two.bottom);
+        return new RectF(left, top, Math.max(right, left), Math.max(bottom, top));
+    }
+
+    public static RectF scale(RectF rect, float scale) {
+        float x = rect.left * scale;
+        float y = rect.top * scale;
+        return new RectF(x, y,
+                x + (rect.width() * scale),
+                y + (rect.height() * scale));
+    }
+
+    /** Returns the nearest integer rect of the given rect. */
+    public static Rect round(RectF rect) {
+        return new Rect(Math.round(rect.left), Math.round(rect.top),
+                Math.round(rect.right), Math.round(rect.bottom));
+    }
+
+    public static IntSize getSize(Rect rect) {
+        return new IntSize(rect.width(), rect.height());
+    }
+
+    public static Point getOrigin(Rect rect) {
+        return new Point(rect.left, rect.top);
+    }
+
+    public static PointF getOrigin(RectF rect) {
+        return new PointF(rect.left, rect.top);
+    }
+
+    /*
+     * Returns the rect that represents a linear transition between `from` and `to` at time `t`,
+     * which is on the scale [0, 1).
+     */
+    public static RectF interpolate(RectF from, RectF to, float t) {
+        return new RectF(FloatUtils.interpolate(from.left, to.left, t),
+                FloatUtils.interpolate(from.top, to.top, t),
+                FloatUtils.interpolate(from.right, to.right, t),
+                FloatUtils.interpolate(from.bottom, to.bottom, t));
+    }
+
+    public static boolean fuzzyEquals(RectF a, RectF b) {
+        return FloatUtils.fuzzyEquals(a.top, b.top)
+                && FloatUtils.fuzzyEquals(a.left, b.left)
+                && FloatUtils.fuzzyEquals(a.right, b.right)
+                && FloatUtils.fuzzyEquals(a.bottom, b.bottom);
+    }
+}
diff --git a/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/ScrollbarLayer.java b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/ScrollbarLayer.java
new file mode 100644
index 000000000000..68b7265b368b
--- /dev/null
+++ b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/ScrollbarLayer.java
@@ -0,0 +1,425 @@
+/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
+ * ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Mozilla Android code.
+ *
+ * The Initial Developer of the Original Code is Mozilla Foundation.
+ * Portions created by the Initial Developer are Copyright (C) 2011
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Kartikaya Gupta <kgupta@mozilla.com>
+ *   Arkady Blyakher <rkadyb@mit.edu>
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+package org.mozilla.gecko.gfx;
+
+import android.graphics.Bitmap;
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.graphics.Paint;
+import android.graphics.PorterDuff;
+import android.graphics.Rect;
+import android.graphics.RectF;
+import android.opengl.GLES20;
+
+import org.libreoffice.LOKitShell;
+import org.mozilla.gecko.util.FloatUtils;
+
+import java.nio.ByteBuffer;
+import java.nio.FloatBuffer;
+
+/**
+ * Draws a small rect. This is scaled to become a scrollbar.
+ */
+public class ScrollbarLayer extends TileLayer {
+    public static final long FADE_DELAY = 500; // milliseconds before fade-out starts
+    private static final float FADE_AMOUNT = 0.03f; // how much (as a percent) the scrollbar should fade per frame
+
+    private static final int PADDING = 1;   // gap between scrollbar and edge of viewport
+    private static final int BAR_SIZE = 6;
+    private static final int CAP_RADIUS = (BAR_SIZE / 2);
+    // Dimensions of the texture image
+    private static final float TEX_HEIGHT = 8.0f;
+    private static final float TEX_WIDTH = 8.0f;
+    // Texture coordinates for the scrollbar's body
+    // We take a 1x1 pixel from the center of the image and scale it to become the bar
+    private static final float[] BODY_TEX_COORDS = {
+            // x, y
+            CAP_RADIUS / TEX_WIDTH, CAP_RADIUS / TEX_HEIGHT,
+            CAP_RADIUS / TEX_WIDTH, (CAP_RADIUS + 1) / TEX_HEIGHT,
+            (CAP_RADIUS + 1) / TEX_WIDTH, CAP_RADIUS / TEX_HEIGHT,
+            (CAP_RADIUS + 1) / TEX_WIDTH, (CAP_RADIUS + 1) / TEX_HEIGHT
+    };
+    // Texture coordinates for the top cap of the scrollbar
+    private static final float[] TOP_CAP_TEX_COORDS = {
+            // x, y
+            0, 1.0f - CAP_RADIUS / TEX_HEIGHT,
+            0, 1.0f,
+            BAR_SIZE / TEX_WIDTH, 1.0f - CAP_RADIUS / TEX_HEIGHT,
+            BAR_SIZE / TEX_WIDTH, 1.0f
+    };
+    // Texture coordinates for the bottom cap of the scrollbar
+    private static final float[] BOT_CAP_TEX_COORDS = {
+            // x, y
+            0, 1.0f - BAR_SIZE / TEX_HEIGHT,
+            0, 1.0f - CAP_RADIUS / TEX_HEIGHT,
+            BAR_SIZE / TEX_WIDTH, 1.0f - BAR_SIZE / TEX_HEIGHT,
+            BAR_SIZE / TEX_WIDTH, 1.0f - CAP_RADIUS / TEX_HEIGHT
+    };
+    // Texture coordinates for the left cap of the scrollbar
+    private static final float[] LEFT_CAP_TEX_COORDS = {
+            // x, y
+            0, 1.0f - BAR_SIZE / TEX_HEIGHT,
+            0, 1.0f,
+            CAP_RADIUS / TEX_WIDTH, 1.0f - BAR_SIZE / TEX_HEIGHT,
+            CAP_RADIUS / TEX_WIDTH, 1.0f
+    };
+    // Texture coordinates for the right cap of the scrollbar
+    private static final float[] RIGHT_CAP_TEX_COORDS = {
+            // x, y
+            CAP_RADIUS / TEX_WIDTH, 1.0f - BAR_SIZE / TEX_HEIGHT,
+            CAP_RADIUS / TEX_WIDTH, 1.0f,
+            BAR_SIZE / TEX_WIDTH, 1.0f - BAR_SIZE / TEX_HEIGHT,
+            BAR_SIZE / TEX_WIDTH, 1.0f
+    };
+    private final boolean mVertical;
+    private final ByteBuffer mBuffer;
+    private final Bitmap mBitmap;
+    private final Canvas mCanvas;
+    private float mOpacity;
+    private boolean mFinalized = false;
+
+    private ScrollbarLayer(CairoImage image, boolean vertical, ByteBuffer buffer) {
+        super(false, image);
+        mVertical = vertical;
+        mBuffer = buffer;
+
+        IntSize size = image.getSize();
+        mBitmap = Bitmap.createBitmap(size.width, size.height, Bitmap.Config.ARGB_8888);
+        mCanvas = new Canvas(mBitmap);
+    }
+
+    public static ScrollbarLayer create(boolean vertical) {
+        // just create an empty image for now, it will get drawn
+        // on demand anyway
+        int imageSize = IntSize.nextPowerOfTwo(BAR_SIZE);
+        ByteBuffer buffer = LOKitShell.allocateDirectBuffer(imageSize * imageSize * 4);
+        CairoImage image = new BufferedCairoImage(buffer, imageSize, imageSize,
+                CairoImage.FORMAT_ARGB32);
+        return new ScrollbarLayer(image, vertical, buffer);
+    }
+
+    protected void finalize() throws Throwable {
+        try {
+            if (!mFinalized && mBuffer != null)
+                LOKitShell.freeDirectBuffer(mBuffer);
+            mFinalized = true;
+        } finally {
+            super.finalize();
+        }
+    }
+
+    /**
+     * Decrease the opacity of the scrollbar by one frame's worth.
+     * Return true if the opacity was decreased, or false if the scrollbars
+     * are already fully faded out.
+     */
+    public boolean fade() {
+        if (FloatUtils.fuzzyEquals(mOpacity, 0.0f)) {
+            return false;
+        }
+        beginTransaction();
+        try {
+            setOpacity(Math.max(mOpacity - FADE_AMOUNT, 0.0f));
+            invalidate();
+        } finally {
+            endTransaction();
+        }
+        return true;
+    }
+
+    /**
+     * Restore the opacity of the scrollbar to fully opaque.
+     * Return true if the opacity was changed, or false if the scrollbars
+     * are already fully opaque.
+     */
+    public boolean unfade() {
+        if (FloatUtils.fuzzyEquals(mOpacity, 1.0f)) {
+            return false;
+        }
+        beginTransaction();
+        try {
+            setOpacity(1.0f);
+            invalidate();
+        } finally {
+            endTransaction();
+        }
+        return true;
+    }
+
+    private void setOpacity(float opacity) {
+        mOpacity = opacity;
+
+        Paint foregroundPaint = new Paint();
+        foregroundPaint.setAntiAlias(true);
+        foregroundPaint.setStyle(Paint.Style.FILL);
+        // use a (a,r,g,b) color of (127,0,0,0), and multiply the alpha by mOpacity for fading
+        foregroundPaint.setColor(Color.argb(Math.round(mOpacity * 127), 0, 0, 0));
+
+        mCanvas.drawColor(Color.argb(0, 0, 0, 0), PorterDuff.Mode.CLEAR);
+        mCanvas.drawCircle(CAP_RADIUS, CAP_RADIUS, CAP_RADIUS, foregroundPaint);
+
+        mBitmap.copyPixelsToBuffer(mBuffer.asIntBuffer());
+    }
+
+    @Override
+    public void draw(RenderContext context) {
+        if (!initialized())
+            return;
+
+        try {
+            GLES20.glEnable(GLES20.GL_BLEND);
+            GLES20.glBlendFunc(GLES20.GL_SRC_ALPHA, GLES20.GL_ONE_MINUS_SRC_ALPHA);
+
+            Rect rect = RectUtils.round(mVertical
+                    ? getVerticalRect(context)
+                    : getHorizontalRect(context));
+            GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, getTextureID());
+
+            float viewWidth = context.viewport.width();
+            float viewHeight = context.viewport.height();
+
+            float top = viewHeight - rect.top;
+            float bot = viewHeight - rect.bottom;
+
+            // Coordinates for the scrollbar's body combined with the texture coordinates
+            float[] bodyCoords = {
+                    // x, y, z, texture_x, texture_y
+                    rect.left / viewWidth, bot / viewHeight, 0,
+                    BODY_TEX_COORDS[0], BODY_TEX_COORDS[1],
+
+                    rect.left / viewWidth, (bot + rect.height()) / viewHeight, 0,
+                    BODY_TEX_COORDS[2], BODY_TEX_COORDS[3],
+
+                    (rect.left + rect.width()) / viewWidth, bot / viewHeight, 0,
+                    BODY_TEX_COORDS[4], BODY_TEX_COORDS[5],
+
+                    (rect.left + rect.width()) / viewWidth, (bot + rect.height()) / viewHeight, 0,
+                    BODY_TEX_COORDS[6], BODY_TEX_COORDS[7]
+            };
+
+            // Get the buffer and handles from the context
+            FloatBuffer coordBuffer = context.coordBuffer;
+            int positionHandle = context.positionHandle;
+            int textureHandle = context.textureHandle;
+
+            // Make sure we are at position zero in the buffer in case other draw methods did not
+            // clean up after themselves
+            coordBuffer.position(0);
+            coordBuffer.put(bodyCoords);
+
+            // Vertex coordinates are x,y,z starting at position 0 into the buffer.
+            coordBuffer.position(0);
+            GLES20.glVertexAttribPointer(positionHandle, 3, GLES20.GL_FLOAT, false, 20,
+                    coordBuffer);
+
+            // Texture coordinates are texture_x, texture_y starting at position 3 into the buffer.
+            coordBuffer.position(3);
+            GLES20.glVertexAttribPointer(textureHandle, 2, GLES20.GL_FLOAT, false, 20,
+                    coordBuffer);
+
+            GLES20.glDrawArrays(GLES20.GL_TRIANGLE_STRIP, 0, 4);
+
+            // Reset the position in the buffer for the next set of vertex and texture coordinates.
+            coordBuffer.position(0);
+
+            if (mVertical) {
+                // top endcap
+                float[] topCap = {
+                        // x, y, z, texture_x, texture_y
+                        rect.left / viewWidth, top / viewHeight, 0,
+                        TOP_CAP_TEX_COORDS[0], TOP_CAP_TEX_COORDS[1],
+
+                        rect.left / viewWidth, (top + CAP_RADIUS) / viewHeight, 0,
+                        TOP_CAP_TEX_COORDS[2], TOP_CAP_TEX_COORDS[3],
+
+                        (rect.left + BAR_SIZE) / viewWidth, top / viewHeight, 0,
+                        TOP_CAP_TEX_COORDS[4], TOP_CAP_TEX_COORDS[5],
+
+                        (rect.left + BAR_SIZE) / viewWidth, (top + CAP_RADIUS) / viewHeight, 0,
+                        TOP_CAP_TEX_COORDS[6], TOP_CAP_TEX_COORDS[7]
+                };
+
+                coordBuffer.put(topCap);
+
+                // Vertex coordinates are x,y,z starting at position 0 into the buffer.
+                coordBuffer.position(0);
+                GLES20.glVertexAttribPointer(positionHandle, 3, GLES20.GL_FLOAT, false, 20,
+                        coordBuffer);
+
+                // Texture coordinates are texture_x, texture_y starting at position 3 into the
+                // buffer.
+                coordBuffer.position(3);
+                GLES20.glVertexAttribPointer(textureHandle, 2, GLES20.GL_FLOAT, false, 20,
+                        coordBuffer);
+
+                GLES20.glDrawArrays(GLES20.GL_TRIANGLE_STRIP, 0, 4);
+
+                // Reset the position in the buffer for the next set of vertex and texture
+                // coordinates.
+                coordBuffer.position(0);
+
+                // bottom endcap
+                float[] botCap = {
+                        // x, y, z, texture_x, texture_y
+                        rect.left / viewWidth, (bot - CAP_RADIUS) / viewHeight, 0,
+                        BOT_CAP_TEX_COORDS[0], BOT_CAP_TEX_COORDS[1],
+
+                        rect.left / viewWidth, (bot) / viewHeight, 0,
+                        BOT_CAP_TEX_COORDS[2], BOT_CAP_TEX_COORDS[3],
+
+                        (rect.left + BAR_SIZE) / viewWidth, (bot - CAP_RADIUS) / viewHeight, 0,
+                        BOT_CAP_TEX_COORDS[4], BOT_CAP_TEX_COORDS[5],
+
+                        (rect.left + BAR_SIZE) / viewWidth, (bot) / viewHeight, 0,
+                        BOT_CAP_TEX_COORDS[6], BOT_CAP_TEX_COORDS[7]
+                };
+
+                coordBuffer.put(botCap);
+
+                // Vertex coordinates are x,y,z starting at position 0 into the buffer.
+                coordBuffer.position(0);
+                GLES20.glVertexAttribPointer(positionHandle, 3, GLES20.GL_FLOAT, false, 20,
+                        coordBuffer);
+
+                // Texture coordinates are texture_x, texture_y starting at position 3 into the
+                // buffer.
+                coordBuffer.position(3);
+                GLES20.glVertexAttribPointer(textureHandle, 2, GLES20.GL_FLOAT, false, 20,
+                        coordBuffer);
+
+                GLES20.glDrawArrays(GLES20.GL_TRIANGLE_STRIP, 0, 4);
+
+                // Reset the position in the buffer for the next set of vertex and texture
+                // coordinates.
+                coordBuffer.position(0);
+            } else {
+                // left endcap
+                float[] leftCap = {
+                        // x, y, z, texture_x, texture_y
+                        (rect.left - CAP_RADIUS) / viewWidth, bot / viewHeight, 0,
+                        LEFT_CAP_TEX_COORDS[0], LEFT_CAP_TEX_COORDS[1],
+                        (rect.left - CAP_RADIUS) / viewWidth, (bot + BAR_SIZE) / viewHeight, 0,
+                        LEFT_CAP_TEX_COORDS[2], LEFT_CAP_TEX_COORDS[3],
+                        (rect.left) / viewWidth, bot / viewHeight, 0, LEFT_CAP_TEX_COORDS[4],
+                        LEFT_CAP_TEX_COORDS[5],
+                        (rect.left) / viewWidth, (bot + BAR_SIZE) / viewHeight, 0,
+                        LEFT_CAP_TEX_COORDS[6], LEFT_CAP_TEX_COORDS[7]
+                };
+
+                coordBuffer.put(leftCap);
+
+                // Vertex coordinates are x,y,z starting at position 0 into the buffer.
+                coordBuffer.position(0);
+                GLES20.glVertexAttribPointer(positionHandle, 3, GLES20.GL_FLOAT, false, 20,
+                        coordBuffer);
+
+                // Texture coordinates are texture_x, texture_y starting at position 3 into the
+                // buffer.
+                coordBuffer.position(3);
+                GLES20.glVertexAttribPointer(textureHandle, 2, GLES20.GL_FLOAT, false, 20,
+                        coordBuffer);
+
+                GLES20.glDrawArrays(GLES20.GL_TRIANGLE_STRIP, 0, 4);
+
+                // Reset the position in the buffer for the next set of vertex and texture
+                // coordinates.
+                coordBuffer.position(0);
+
+                // right endcap
+                float[] rightCap = {
+                        // x, y, z, texture_x, texture_y
+                        rect.right / viewWidth, (bot) / viewHeight, 0,
+                        RIGHT_CAP_TEX_COORDS[0], RIGHT_CAP_TEX_COORDS[1],
+
+                        rect.right / viewWidth, (bot + BAR_SIZE) / viewHeight, 0,
+                        RIGHT_CAP_TEX_COORDS[2], RIGHT_CAP_TEX_COORDS[3],
+
+                        (rect.right + CAP_RADIUS) / viewWidth, (bot) / viewHeight, 0,
+                        RIGHT_CAP_TEX_COORDS[4], RIGHT_CAP_TEX_COORDS[5],
+
+                        (rect.right + CAP_RADIUS) / viewWidth, (bot + BAR_SIZE) / viewHeight, 0,
+                        RIGHT_CAP_TEX_COORDS[6], RIGHT_CAP_TEX_COORDS[7]
+                };
+
+                coordBuffer.put(rightCap);
+
+                // Vertex coordinates are x,y,z starting at position 0 into the buffer.
+                coordBuffer.position(0);
+                GLES20.glVertexAttribPointer(positionHandle, 3, GLES20.GL_FLOAT, false, 20,
+                        coordBuffer);
+
+                // Texture coordinates are texture_x, texture_y starting at position 3 into the
+                // buffer.
+                coordBuffer.position(3);
+                GLES20.glVertexAttribPointer(textureHandle, 2, GLES20.GL_FLOAT, false, 20,
+                        coordBuffer);
+
+                GLES20.glDrawArrays(GLES20.GL_TRIANGLE_STRIP, 0, 4);
+            }
+        } finally {
+            GLES20.glDisable(GLES20.GL_BLEND);
+        }
+    }
+
+    private RectF getVerticalRect(RenderContext context) {
+        RectF viewport = context.viewport;
+        FloatSize pageSize = context.pageSize;
+        float barStart = (viewport.height() * viewport.top / pageSize.height) + CAP_RADIUS;
+        float barEnd = (viewport.height() * viewport.bottom / pageSize.height) - CAP_RADIUS;
+        if (barStart > barEnd) {
+            float middle = (barStart + barEnd) / 2.0f;
+            barStart = barEnd = middle;
+        }
+        float right = viewport.width() - PADDING;
+        return new RectF(right - BAR_SIZE, barStart, right, barEnd);
+    }
+
+    private RectF getHorizontalRect(RenderContext context) {
+        RectF viewport = context.viewport;
+        FloatSize pageSize = context.pageSize;
+        float barStart = (viewport.width() * viewport.left / pageSize.width) + CAP_RADIUS;
+        float barEnd = (viewport.width() * viewport.right / pageSize.width) - CAP_RADIUS;
+        if (barStart > barEnd) {
+            float middle = (barStart + barEnd) / 2.0f;
+            barStart = barEnd = middle;
+        }
+        float bottom = viewport.height() - PADDING;
+        return new RectF(barStart, bottom - BAR_SIZE, barEnd, bottom);
+    }
+}
diff --git a/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/SingleTileLayer.java b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/SingleTileLayer.java
new file mode 100644
index 000000000000..d18579e1a117
--- /dev/null
+++ b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/SingleTileLayer.java
@@ -0,0 +1,127 @@
+/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
+ * ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Mozilla Android code.
+ *
+ * The Initial Developer of the Original Code is Mozilla Foundation.
+ * Portions created by the Initial Developer are Copyright (C) 2009-2010
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Patrick Walton <pcwalton@mozilla.com>
+ *   Arkady Blyakher <rkadyb@mit.edu>
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+package org.mozilla.gecko.gfx;
+
+import org.mozilla.gecko.gfx.CairoImage;
+import org.mozilla.gecko.gfx.CairoUtils;
+import org.mozilla.gecko.gfx.IntSize;
+import org.mozilla.gecko.gfx.LayerController;
+import org.mozilla.gecko.gfx.TileLayer;
+import android.graphics.PointF;
+import android.graphics.RectF;
+import android.opengl.GLES20;
+import android.util.Log;
+import java.nio.FloatBuffer;
+import javax.microedition.khronos.opengles.GL10;
+
+/**
+ * Encapsulates the logic needed to draw a single textured tile.
+ *
+ * TODO: Repeating textures really should be their own type of layer.
+ */
+public class SingleTileLayer extends TileLayer {
+    public SingleTileLayer(CairoImage image) { this(false, image); }
+
+    public SingleTileLayer(boolean repeat, CairoImage image) {
+        super(repeat, image);
+    }
+
+    @Override
+    public void draw(RenderContext context) {
+        // mTextureIDs may be null here during startup if Layer.java's draw method
+        // failed to acquire the transaction lock and call performUpdates.
+        if (!initialized())
+            return;
+
+        GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, getTextureID());
+
+        RectF bounds;
+        int[] cropRect;
+        IntSize size = getSize();
+        RectF viewport = context.viewport;
+
+        if (repeats()) {
+            bounds = new RectF(0.0f, 0.0f, viewport.width(), viewport.height());
+            int width = Math.round(viewport.width());
+            int height = Math.round(viewport.height());
+            cropRect = new int[] { 0, 0, width, height };
+        } else {
+            bounds = getBounds(context, new FloatSize(size));
+            cropRect = new int[] { 0, 0, size.width, size.height };
+        }
+
+        float height = bounds.height();
+        float left = bounds.left - viewport.left;
+        float top = viewport.height() - (bounds.top + height - viewport.top);
+
+        float[] coords = {
+                //x, y, z, texture_x, texture_y
+                left/viewport.width(), top/viewport.height(), 0,
+                cropRect[0]/(float)size.width, cropRect[1]/(float)size.height,
+
+                left/viewport.width(), (top+height)/viewport.height(), 0,
+                cropRect[0]/(float)size.width, cropRect[3]/(float)size.height,
+
+                (left+bounds.width())/viewport.width(), top/viewport.height(), 0,
+                cropRect[2]/(float)size.width, cropRect[1]/(float)size.height,
+
+                (left+bounds.width())/viewport.width(), (top+height)/viewport.height(), 0,
+                cropRect[2]/(float)size.width, cropRect[3]/(float)size.height
+        };
+
+        FloatBuffer coordBuffer = context.coordBuffer;
+        int positionHandle = context.positionHandle;
+        int textureHandle = context.textureHandle;
+
+        // Make sure we are at position zero in the buffer in case other draw methods did not clean
+        // up after themselves
+        coordBuffer.position(0);
+        coordBuffer.put(coords);
+
+        // Vertex coordinates are x,y,z starting at position 0 into the buffer.
+        coordBuffer.position(0);
+        GLES20.glVertexAttribPointer(positionHandle, 3, GLES20.GL_FLOAT, false, 20, coordBuffer);
+
+        // Texture coordinates are texture_x, texture_y starting at position 3 into the buffer.
+        coordBuffer.position(3);
+        GLES20.glVertexAttribPointer(textureHandle, 2, GLES20.GL_FLOAT, false, 20, coordBuffer);
+        GLES20.glDrawArrays(GLES20.GL_TRIANGLE_STRIP, 0, 4);
+    }
+}
+
diff --git a/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/TextLayer.java b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/TextLayer.java
new file mode 100644
index 000000000000..f2cc640baaa7
--- /dev/null
+++ b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/TextLayer.java
@@ -0,0 +1,117 @@
+/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
+ * ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Mozilla Android code.
+ *
+ * The Initial Developer of the Original Code is Mozilla Foundation.
+ * Portions created by the Initial Developer are Copyright (C) 2009-2010
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Patrick Walton <pcwalton@mozilla.com>
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+package org.mozilla.gecko.gfx;
+
+//import org.mozilla.gecko.GeckoAppShell;
+import org.libreoffice.LOKitShell;
+import org.mozilla.gecko.gfx.BufferedCairoImage;
+import org.mozilla.gecko.gfx.CairoImage;
+import org.mozilla.gecko.gfx.IntSize;
+import org.mozilla.gecko.gfx.SingleTileLayer;
+import android.graphics.Bitmap;
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.graphics.Paint;
+import android.graphics.Typeface;
+import android.util.Log;
+import java.nio.ByteBuffer;
+import java.nio.IntBuffer;
+
+/**
+ * Draws text on a layer. This is used for the frame rate meter.
+ */
+public class TextLayer extends SingleTileLayer {
+    private final ByteBuffer mBuffer;
+    private final IntSize mSize;
+    private boolean mFinalized = false;
+
+    /*
+     * This awkward pattern is necessary due to Java's restrictions on when one can call superclass
+     * constructors.
+     */
+    private TextLayer(ByteBuffer buffer, BufferedCairoImage image, IntSize size, String text) {
+        super(false, image);
+        mBuffer = buffer;
+        mSize = size;
+        renderText(text);
+    }
+
+    protected void finalize() throws Throwable {
+        try {
+            if (!mFinalized && mBuffer != null)
+                /*GeckoAppShell*/ LOKitShell.freeDirectBuffer(mBuffer);
+            mFinalized = true;
+        } finally {
+            super.finalize();
+        }
+    }
+
+    public static TextLayer create(IntSize size, String text) {
+        ByteBuffer buffer = /*GeckoAppShell*/LOKitShell.allocateDirectBuffer(size.width * size.height * 4);
+        BufferedCairoImage image = new BufferedCairoImage(buffer, size.width, size.height,
+                                                          CairoImage.FORMAT_ARGB32);
+        return new TextLayer(buffer, image, size, text);
+    }
+
+    public void setText(String text) {
+        renderText(text);
+        invalidate();
+    }
+
+    private void renderText(String text) {
+        Bitmap bitmap = Bitmap.createBitmap(mSize.width, mSize.height, Bitmap.Config.ARGB_8888);
+        Canvas canvas = new Canvas(bitmap);
+
+        Paint textPaint = new Paint();
+        textPaint.setAntiAlias(true);
+        textPaint.setColor(Color.WHITE);
+        textPaint.setFakeBoldText(true);
+        textPaint.setTextSize(18.0f);
+        textPaint.setTypeface(Typeface.DEFAULT_BOLD);
+        float width = textPaint.measureText(text) + 18.0f;
+
+        Paint backgroundPaint = new Paint();
+        backgroundPaint.setColor(Color.argb(127, 0, 0, 0));
+        canvas.drawRect(0.0f, 0.0f, width, 18.0f + 6.0f, backgroundPaint);
+
+        canvas.drawText(text, 6.0f, 18.0f, textPaint);
+
+        bitmap.copyPixelsToBuffer(mBuffer.asIntBuffer());
+    }
+}
+
diff --git a/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/TextureGenerator.java b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/TextureGenerator.java
new file mode 100644
index 000000000000..4392c55e1ae7
--- /dev/null
+++ b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/TextureGenerator.java
@@ -0,0 +1,73 @@
+/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
+ * ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Mozilla Android code.
+ *
+ * The Initial Developer of the Original Code is Mozilla Foundation.
+ * Portions created by the Initial Developer are Copyright (C) 2009-2010
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   James Willcox <jwillcox@mozilla.com>
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+package org.mozilla.gecko.gfx;
+
+import android.opengl.GLES10;
+import java.util.Stack;
+
+public class TextureGenerator {
+    private static final int MIN_TEXTURES = 5;
+
+    private static TextureGenerator sSharedInstance;
+    private Stack<Integer> mTextureIds;
+
+    private TextureGenerator() { mTextureIds = new Stack<Integer>(); }
+
+    public static TextureGenerator get() {
+        if (sSharedInstance == null)
+            sSharedInstance = new TextureGenerator();
+        return sSharedInstance;
+    }
+
+    public synchronized int take() {
+        if (mTextureIds.empty())
+            return 0;
+
+        return (int)mTextureIds.pop();
+    }
+
+    public synchronized void fill() {
+        int[] textures = new int[1];
+        while (mTextureIds.size() < MIN_TEXTURES) {
+            GLES10.glGenTextures(1, textures, 0);
+            mTextureIds.push(textures[0]);
+        }
+    }
+}
+
+
diff --git a/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/TextureReaper.java b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/TextureReaper.java
new file mode 100644
index 000000000000..e18139cb9bc9
--- /dev/null
+++ b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/TextureReaper.java
@@ -0,0 +1,76 @@
+/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
+ * ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Mozilla Android code.
+ *
+ * The Initial Developer of the Original Code is Mozilla Foundation.
+ * Portions created by the Initial Developer are Copyright (C) 2009-2010
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Patrick Walton <pcwalton@mozilla.com>
+ *   Arkady Blyakher <rkadyb@mit.edu>
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+package org.mozilla.gecko.gfx;
+
+import android.opengl.GLES20;
+import java.util.ArrayList;
+
+/** Manages a list of dead tiles, so we don't leak resources. */
+public class TextureReaper {
+    private static TextureReaper sSharedInstance;
+    private ArrayList<Integer> mDeadTextureIDs;
+
+    private TextureReaper() { mDeadTextureIDs = new ArrayList<Integer>(); }
+
+    public static TextureReaper get() {
+        if (sSharedInstance == null)
+            sSharedInstance = new TextureReaper();
+        return sSharedInstance;
+    }
+
+    public void add(int[] textureIDs) {
+        for (int textureID : textureIDs)
+            add(textureID);
+    }
+
+    public void add(int textureID) {
+        mDeadTextureIDs.add(textureID);
+    }
+
+    public void reap() {
+        int[] deadTextureIDs = new int[mDeadTextureIDs.size()];
+        for (int i = 0; i < deadTextureIDs.length; i++)
+            deadTextureIDs[i] = mDeadTextureIDs.get(i);
+        mDeadTextureIDs.clear();
+
+        GLES20.glDeleteTextures(deadTextureIDs.length, deadTextureIDs, 0);
+    }
+}
+
+
diff --git a/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/TileLayer.java b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/TileLayer.java
new file mode 100644
index 000000000000..64ec94dc694a
--- /dev/null
+++ b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/TileLayer.java
@@ -0,0 +1,256 @@
+/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
+ * ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Mozilla Android code.
+ *
+ * The Initial Developer of the Original Code is Mozilla Foundation.
+ * Portions created by the Initial Developer are Copyright (C) 2009-2010
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Patrick Walton <pcwalton@mozilla.com>
+ *   Arkady Blyakher <rkadyb@mit.edu>
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+package org.mozilla.gecko.gfx;
+
+import android.graphics.Point;
+import android.graphics.Rect;
+import android.graphics.RectF;
+import android.graphics.Region;
+import android.opengl.GLES20;
+import android.util.Log;
+import java.nio.Buffer;
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+import java.nio.FloatBuffer;
+
+/**
+ * Base class for tile layers, which encapsulate the logic needed to draw textured tiles in OpenGL
+ * ES.
+ */
+public abstract class TileLayer extends Layer {
+    private static final String LOGTAG = "GeckoTileLayer";
+
+    private final Rect mDirtyRect;
+    private final CairoImage mImage;
+    private final boolean mRepeat;
+    private IntSize mSize;
+    private boolean mSkipTextureUpdate;
+    private int[] mTextureIDs;
+
+    public TileLayer(boolean repeat, CairoImage image) {
+        mRepeat = repeat;
+        mImage = image;
+        mSize = new IntSize(0, 0);
+        mSkipTextureUpdate = false;
+
+        IntSize bufferSize = mImage.getSize();
+        mDirtyRect = new Rect();
+    }
+
+    @Override
+    public IntSize getSize() { return mImage.getSize(); }
+
+    protected boolean repeats() { return mRepeat; }
+    protected int getTextureID() { return mTextureIDs[0]; }
+    protected boolean initialized() { return mImage != null && mTextureIDs != null; }
+
+    @Override
+    protected void finalize() throws Throwable {
+        if (mTextureIDs != null)
+            TextureReaper.get().add(mTextureIDs);
+    }
+
+    /**
+     * Invalidates the given rect so that it will be uploaded again. Only valid inside a
+     * transaction.
+     */
+    public void invalidate(Rect rect) {
+        if (!inTransaction())
+            throw new RuntimeException("invalidate() is only valid inside a transaction");
+        mDirtyRect.union(rect);
+    }
+
+    public void invalidate() {
+        IntSize bufferSize = mImage.getSize();
+        invalidate(new Rect(0, 0, bufferSize.width, bufferSize.height));
+    }
+
+    public boolean isDirty() {
+        return mImage.getSize().isPositive() && (mTextureIDs == null || !mDirtyRect.isEmpty());
+    }
+
+    private void validateTexture() {
+        /* Calculate the ideal texture size. This must be a power of two if
+         * the texture is repeated or OpenGL ES 2.0 isn't supported, as
+         * OpenGL ES 2.0 is required for NPOT texture support (without
+         * extensions), but doesn't support repeating NPOT textures.
+         *
+         * XXX Currently, we don't pick a GLES 2.0 context, so always round.
+         */
+        IntSize bufferSize = mImage.getSize();
+        IntSize textureSize = bufferSize;
+
+        textureSize = bufferSize.nextPowerOfTwo();
+
+        if (!textureSize.equals(mSize)) {
+            mSize = textureSize;
+
+            // Delete the old texture
+            if (mTextureIDs != null) {
+                TextureReaper.get().add(mTextureIDs);
+                mTextureIDs = null;
+
+                // Free the texture immediately, so we don't incur a
+                // temporarily increased memory usage.
+                TextureReaper.get().reap();
+            }
+        }
+    }
+
+    /** Tells the tile not to update the texture on the next update. */
+    public void setSkipTextureUpdate(boolean skip) {
+        mSkipTextureUpdate = skip;
+    }
+
+    public boolean getSkipTextureUpdate() {
+        return mSkipTextureUpdate;
+    }
+
+    @Override
+    protected boolean performUpdates(RenderContext context) {
+        super.performUpdates(context);
+
+        if (mSkipTextureUpdate) {
+            return false;
+        }
+
+        // Reallocate the texture if the size has changed
+        validateTexture();
+
+        // Don't do any work if the image has an invalid size.
+        if (!mImage.getSize().isPositive())
+            return true;
+
+        // If we haven't allocated a texture, assume the whole region is dirty
+        if (mTextureIDs == null) {
+            uploadFullTexture();
+        } else {
+            uploadDirtyRect(mDirtyRect);
+        }
+
+        mDirtyRect.setEmpty();
+
+        return true;
+    }
+
+    private void uploadFullTexture() {
+        IntSize bufferSize = mImage.getSize();
+        uploadDirtyRect(new Rect(0, 0, bufferSize.width, bufferSize.height));
+    }
+
+    private void uploadDirtyRect(Rect dirtyRect) {
+        // If we have nothing to upload, just return for now
+        if (dirtyRect.isEmpty())
+            return;
+
+        // It's possible that the buffer will be null, check for that and return
+        ByteBuffer imageBuffer = mImage.getBuffer();
+        if (imageBuffer == null)
+            return;
+
+        boolean newlyCreated = false;
+
+        if (mTextureIDs == null) {
+            mTextureIDs = new int[1];
+            GLES20.glGenTextures(mTextureIDs.length, mTextureIDs, 0);
+            newlyCreated = true;
+        }
+
+        IntSize bufferSize = mImage.getSize();
+        Rect bufferRect = new Rect(0, 0, bufferSize.width, bufferSize.height);
+
+        int cairoFormat = mImage.getFormat();
+        CairoGLInfo glInfo = new CairoGLInfo(cairoFormat);
+
+        bindAndSetGLParameters();
+
+        if (newlyCreated || dirtyRect.contains(bufferRect)) {
+            if (mSize.equals(bufferSize)) {
+                GLES20.glTexImage2D(GLES20.GL_TEXTURE_2D, 0, glInfo.internalFormat, mSize.width,
+                        mSize.height, 0, glInfo.format, glInfo.type, imageBuffer);
+                return;
+            } else {
+                GLES20.glTexImage2D(GLES20.GL_TEXTURE_2D, 0, glInfo.internalFormat, mSize.width,
+                        mSize.height, 0, glInfo.format, glInfo.type, null);
+                GLES20.glTexSubImage2D(GLES20.GL_TEXTURE_2D, 0, 0, 0, bufferSize.width,
+                        bufferSize.height, glInfo.format, glInfo.type, imageBuffer);
+                return;
+            }
+        }
+
+        // Make sure that the dirty region intersects with the buffer rect,
+        // otherwise we'll end up with an invalid buffer pointer.
+        if (!Rect.intersects(dirtyRect, bufferRect)) {
+            return;
+        }
+
+        /*
+         * Upload the changed rect. We have to widen to the full width of the texture
+         * because we can't count on the device having support for GL_EXT_unpack_subimage,
+         * and going line-by-line is too slow.
+         *
+         * XXX We should still use GL_EXT_unpack_subimage when available.
+         */
+        Buffer viewBuffer = imageBuffer.slice();
+        int bpp = CairoUtils.bitsPerPixelForCairoFormat(cairoFormat) / 8;
+        int position = dirtyRect.top * bufferSize.width * bpp;
+        if (position > viewBuffer.limit()) {
+            Log.e(LOGTAG, "### Position outside tile! " + dirtyRect.top);
+            return;
+        }
+
+        viewBuffer.position(position);
+        GLES20.glTexSubImage2D(GLES20.GL_TEXTURE_2D, 0, 0, dirtyRect.top, bufferSize.width,
+                Math.min(bufferSize.height - dirtyRect.top, dirtyRect.height()),
+                glInfo.format, glInfo.type, viewBuffer);
+    }
+
+    private void bindAndSetGLParameters() {
+        GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, mTextureIDs[0]);
+        GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MIN_FILTER,
+                GLES20.GL_NEAREST);
+        GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MAG_FILTER,
+                GLES20.GL_LINEAR);
+
+        int repeatMode = mRepeat ? GLES20.GL_REPEAT : GLES20.GL_CLAMP_TO_EDGE;
+        GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_S, repeatMode);
+        GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_T, repeatMode);
+    }
+}
+
diff --git a/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/ViewTransform.java b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/ViewTransform.java
new file mode 100644
index 000000000000..9f443ea52894
--- /dev/null
+++ b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/ViewTransform.java
@@ -0,0 +1,51 @@
+/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
+ * ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Mozilla Android code.
+ *
+ * The Initial Developer of the Original Code is Mozilla Foundation.
+ * Portions created by the Initial Developer are Copyright (C) 2009-2010
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Patrick Walton <pcwalton@mozilla.com>
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+package org.mozilla.gecko.gfx;
+
+public class ViewTransform {
+    public float x;
+    public float y;
+    public float scale;
+
+    public ViewTransform(float inX, float inY, float inScale) {
+        x = inX;
+        y = inY;
+        scale = inScale;
+    }
+}
+
diff --git a/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/ViewportMetrics.java b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/ViewportMetrics.java
new file mode 100644
index 000000000000..d98b47421520
--- /dev/null
+++ b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/ViewportMetrics.java
@@ -0,0 +1,306 @@
+/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
+ * ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Mozilla Android code.
+ *
+ * The Initial Developer of the Original Code is Mozilla Foundation.
+ * Portions created by the Initial Developer are Copyright (C) 2009-2010
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Patrick Walton <pcwalton@mozilla.com>
+ *   Chris Lord <chrislord.net@gmail.com>
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+package org.mozilla.gecko.gfx;
+
+import android.graphics.PointF;
+import android.graphics.RectF;
+import android.util.DisplayMetrics;
+
+import org.json.JSONException;
+import org.json.JSONObject;
+import org.libreoffice.LibreOfficeMainActivity;
+import org.mozilla.gecko.util.FloatUtils;
+
+/**
+ * ViewportMetrics manages state and contains some utility functions related to
+ * the page viewport for the Gecko layer client to use.
+ */
+public class ViewportMetrics {
+    private static final String LOGTAG = "GeckoViewportMetrics";
+    private static final float MAX_BIAS = 0.8f;
+    private FloatSize mPageSize;
+    private RectF mViewportRect;
+    private PointF mViewportOffset;
+    private float mZoomFactor;
+    // A scale from -1,-1 to 1,1 that represents what edge of the displayport
+    // we want the viewport to be biased towards.
+    private PointF mViewportBias;
+
+    public ViewportMetrics() {
+        DisplayMetrics metrics = new DisplayMetrics();
+        LibreOfficeMainActivity.mAppContext.getWindowManager().getDefaultDisplay().getMetrics(metrics);
+
+        mPageSize = new FloatSize(metrics.widthPixels, metrics.heightPixels);
+        mViewportRect = new RectF(0, 0, metrics.widthPixels, metrics.heightPixels);
+        mViewportOffset = new PointF(0, 0);
+        mZoomFactor = 1.0f;
+        mViewportBias = new PointF(0.0f, 0.0f);
+    }
+
+    public ViewportMetrics(ViewportMetrics viewport) {
+        mPageSize = new FloatSize(viewport.getPageSize());
+        mViewportRect = new RectF(viewport.getViewport());
+        PointF offset = viewport.getViewportOffset();
+        mViewportOffset = new PointF(offset.x, offset.y);
+        mZoomFactor = viewport.getZoomFactor();
+        mViewportBias = viewport.mViewportBias;
+    }
+
+    public ViewportMetrics(JSONObject json) throws JSONException {
+        float x = (float) json.getDouble("x");
+        float y = (float) json.getDouble("y");
+        float width = (float) json.getDouble("width");
+        float height = (float) json.getDouble("height");
+        float pageWidth = (float) json.getDouble("pageWidth");
+        float pageHeight = (float) json.getDouble("pageHeight");
+        float offsetX = (float) json.getDouble("offsetX");
+        float offsetY = (float) json.getDouble("offsetY");
+        float zoom = (float) json.getDouble("zoom");
+
+        mPageSize = new FloatSize(pageWidth, pageHeight);
+        mViewportRect = new RectF(x, y, x + width, y + height);
+        mViewportOffset = new PointF(offsetX, offsetY);
+        mZoomFactor = zoom;
+        mViewportBias = new PointF(0.0f, 0.0f);
+    }
+
+    public PointF getOptimumViewportOffset(IntSize displayportSize) {
+        /* XXX Until bug #524925 is fixed, changing the viewport origin will
+         *     cause unnecessary relayouts. This may cause rendering time to
+         *     increase and should be considered.
+         */
+        RectF viewport = getClampedViewport();
+
+        FloatSize bufferSpace = new FloatSize(displayportSize.width - viewport.width(),
+                displayportSize.height - viewport.height());
+        PointF optimumOffset =
+                new PointF(bufferSpace.width * ((mViewportBias.x + 1.0f) / 2.0f),
+                        bufferSpace.height * ((mViewportBias.y + 1.0f) / 2.0f));
+
+        // Make sure this offset won't cause wasted pixels in the displayport
+        // (i.e. make sure the resultant displayport intersects with the page
+        //  as much as possible)
+        if (viewport.left - optimumOffset.x < 0)
+            optimumOffset.x = viewport.left;
+        else if ((bufferSpace.width - optimumOffset.x) + viewport.right > mPageSize.width)
+            optimumOffset.x = bufferSpace.width - (mPageSize.width - viewport.right);
+
+        if (viewport.top - optimumOffset.y < 0)
+            optimumOffset.y = viewport.top;
+        else if ((bufferSpace.height - optimumOffset.y) + viewport.bottom > mPageSize.height)
+            optimumOffset.y = bufferSpace.height - (mPageSize.height - viewport.bottom);
+
+        return new PointF(Math.round(optimumOffset.x), Math.round(optimumOffset.y));
+    }
+
+    public PointF getOrigin() {
+        return new PointF(mViewportRect.left, mViewportRect.top);
+    }
+
+    public void setOrigin(PointF origin) {
+        // When the origin is set, we compare it with the last value set and
+        // change the viewport bias accordingly, so that any viewport based
+        // on these metrics will have a larger buffer in the direction of
+        // movement.
+
+        // XXX Note the comment about bug #524925 in getOptimumViewportOffset.
+        //     Ideally, the viewport bias would be a sliding scale, but we
+        //     don't want to change it too often at the moment.
+        if (FloatUtils.fuzzyEquals(origin.x, mViewportRect.left))
+            mViewportBias.x = 0;
+        else
+            mViewportBias.x = ((mViewportRect.left - origin.x) > 0) ? MAX_BIAS : -MAX_BIAS;
+        if (FloatUtils.fuzzyEquals(origin.y, mViewportRect.top))
+            mViewportBias.y = 0;
+        else
+            mViewportBias.y = ((mViewportRect.top - origin.y) > 0) ? MAX_BIAS : -MAX_BIAS;
+
+        mViewportRect.set(origin.x, origin.y,
+                origin.x + mViewportRect.width(),
+                origin.y + mViewportRect.height());
+    }
+
+    public PointF getDisplayportOrigin() {
+        return new PointF(mViewportRect.left - mViewportOffset.x,
+                mViewportRect.top - mViewportOffset.y);
+    }
+
+    public FloatSize getSize() {
+        return new FloatSize(mViewportRect.width(), mViewportRect.height());
+    }
+
+    public void setSize(FloatSize size) {
+        mViewportRect.right = mViewportRect.left + size.width;
+        mViewportRect.bottom = mViewportRect.top + size.height;
+    }
+
+    public RectF getViewport() {
+        return mViewportRect;
+    }
+
+    public void setViewport(RectF viewport) {
+        mViewportRect = viewport;
+    }
+
+    /**
+     * Returns the viewport rectangle, clamped within the page-size.
+     */
+    public RectF getClampedViewport() {
+        RectF clampedViewport = new RectF(mViewportRect);
+
+        // While the viewport size ought to never exceed the page size, we
+        // do the clamping in this order to make sure that the origin is
+        // never negative.
+        if (clampedViewport.right > mPageSize.width)
+            clampedViewport.offset(mPageSize.width - clampedViewport.right, 0);
+        if (clampedViewport.left < 0)
+            clampedViewport.offset(-clampedViewport.left, 0);
+
+        if (clampedViewport.bottom > mPageSize.height)
+            clampedViewport.offset(0, mPageSize.height - clampedViewport.bottom);
+        if (clampedViewport.top < 0)
+            clampedViewport.offset(0, -clampedViewport.top);
+
+        return clampedViewport;
+    }
+
+    public PointF getViewportOffset() {
+        return mViewportOffset;
+    }
+
+    public void setViewportOffset(PointF offset) {
+        mViewportOffset = offset;
+    }
+
+    public FloatSize getPageSize() {
+        return mPageSize;
+    }
+
+    public void setPageSize(FloatSize pageSize) {
+        mPageSize = pageSize;
+    }
+
+    public float getZoomFactor() {
+        return mZoomFactor;
+    }
+
+    public void setZoomFactor(float zoomFactor) {
+        mZoomFactor = zoomFactor;
+    }
+
+    /* This will set the zoom factor and re-scale page-size and viewport offset
+     * accordingly. The given focus will remain at the same point on the screen
+     * after scaling.
+     */
+    public void scaleTo(float newZoomFactor, PointF focus) {
+        float scaleFactor = newZoomFactor / mZoomFactor;
+
+        mPageSize = mPageSize.scale(scaleFactor);
+
+        PointF origin = getOrigin();
+        origin.offset(focus.x, focus.y);
+        origin = PointUtils.scale(origin, scaleFactor);
+        origin.offset(-focus.x, -focus.y);
+        setOrigin(origin);
+
+        mZoomFactor = newZoomFactor;
+
+        // Similar to setOrigin, set the viewport bias based on the focal point
+        // of the zoom so that a viewport based on these metrics will have a
+        // larger buffer based on the direction of movement when scaling.
+        //
+        // This is biased towards scaling outwards, as zooming in doesn't
+        // really require a viewport bias.
+        mViewportBias.set(((focus.x / mViewportRect.width()) * (2.0f * MAX_BIAS)) - MAX_BIAS,
+                ((focus.y / mViewportRect.height()) * (2.0f * MAX_BIAS)) - MAX_BIAS);
+    }
+
+    /*
+     * Returns the viewport metrics that represent a linear transition between `from` and `to` at
+     * time `t`, which is on the scale [0, 1). This function interpolates the viewport rect, the
+     * page size, the offset, and the zoom factor.
+     */
+    public ViewportMetrics interpolate(ViewportMetrics to, float t) {
+        ViewportMetrics result = new ViewportMetrics();
+        result.mPageSize = mPageSize.interpolate(to.mPageSize, t);
+        result.mZoomFactor = FloatUtils.interpolate(mZoomFactor, to.mZoomFactor, t);
+        result.mViewportRect = RectUtils.interpolate(mViewportRect, to.mViewportRect, t);
+        result.mViewportOffset = PointUtils.interpolate(mViewportOffset, to.mViewportOffset, t);
+        return result;
+    }
+
+    public boolean fuzzyEquals(ViewportMetrics other) {
+        return mPageSize.fuzzyEquals(other.mPageSize)
+                && RectUtils.fuzzyEquals(mViewportRect, other.mViewportRect)
+                && FloatUtils.fuzzyEquals(mViewportOffset, other.mViewportOffset)
+                && FloatUtils.fuzzyEquals(mZoomFactor, other.mZoomFactor);
+    }
+
+    public String toJSON() {
+        // Round off height and width. Since the height and width are the size of the screen, it
+        // makes no sense to send non-integer coordinates to Gecko.
+        int height = Math.round(mViewportRect.height());
+        int width = Math.round(mViewportRect.width());
+
+        StringBuffer sb = new StringBuffer(256);
+        sb.append("{ \"x\" : ").append(mViewportRect.left)
+                .append(", \"y\" : ").append(mViewportRect.top)
+                .append(", \"width\" : ").append(width)
+                .append(", \"height\" : ").append(height)
+                .append(", \"pageWidth\" : ").append(mPageSize.width)
+                .append(", \"pageHeight\" : ").append(mPageSize.height)
+                .append(", \"offsetX\" : ").append(mViewportOffset.x)
+                .append(", \"offsetY\" : ").append(mViewportOffset.y)
+                .append(", \"zoom\" : ").append(mZoomFactor)
+                .append(" }");
+        return sb.toString();
+    }
+
+    @Override
+    public String toString() {
+        StringBuffer buff = new StringBuffer(128);
+        buff.append("v=").append(mViewportRect.toString())
+                .append(" p=").append(mPageSize.toString())
+                .append(" z=").append(mZoomFactor)
+                .append(" o=").append(mViewportOffset.x)
+                .append(',').append(mViewportOffset.y);
+        return buff.toString();
+    }
+}
+
diff --git a/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/VirtualLayer.java b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/VirtualLayer.java
new file mode 100644
index 000000000000..0f314ae71620
--- /dev/null
+++ b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/VirtualLayer.java
@@ -0,0 +1,80 @@
+/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
+ * ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Mozilla Android code.
+ *
+ * The Initial Developer of the Original Code is Mozilla Foundation.
+ * Portions created by the Initial Developer are Copyright (C) 2009-2010
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Patrick Walton <pcwalton@mozilla.com>
+ *   Chris Lord <chrislord.net@gmail.com>
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+package org.mozilla.gecko.gfx;
+
+import android.graphics.Point;
+
+public class VirtualLayer extends Layer {
+    private Listener mListener;
+    private IntSize mSize;
+
+    public void setListener(Listener listener) {
+        mListener = listener;
+    }
+
+    @Override
+    public void draw(RenderContext context) {
+        // No-op.
+    }
+
+    @Override
+    public IntSize getSize() {
+        return mSize;
+    }
+
+    public void setSize(IntSize size) {
+        mSize = size;
+    }
+
+    @Override
+    protected boolean performUpdates(RenderContext context) {
+        boolean dimensionsChanged = dimensionChangesPending();
+        boolean result = super.performUpdates(context);
+        if (dimensionsChanged && mListener != null) {
+            mListener.dimensionsChanged(getOrigin(), getResolution());
+        }
+
+        return result;
+    }
+
+    public interface Listener {
+        void dimensionsChanged(Point newOrigin, float newResolution);
+    }
+}
+
diff --git a/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/WidgetTileLayer.java b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/WidgetTileLayer.java
new file mode 100644
index 000000000000..b123d55c403d
--- /dev/null
+++ b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/WidgetTileLayer.java
@@ -0,0 +1,160 @@
+/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
+ * ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Mozilla Android code.
+ *
+ * The Initial Developer of the Original Code is Mozilla Foundation.
+ * Portions created by the Initial Developer are Copyright (C) 2009-2010
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   James Willcox <jwillcox@mozilla.com>
+ *   Arkady Blyakher <rkadyb@mit.edu>
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+package org.mozilla.gecko.gfx;
+
+import org.libreoffice.LOKitShell;
+import org.mozilla.gecko.gfx.LayerController;
+import org.mozilla.gecko.gfx.SingleTileLayer;
+//import org.mozilla.gecko.GeckoAppShell;
+import android.graphics.RectF;
+import android.util.Log;
+import android.opengl.GLES20;
+import java.nio.FloatBuffer;
+
+/**
+ * Encapsulates the logic needed to draw the single-tiled Gecko texture
+ */
+public class WidgetTileLayer extends Layer {
+    private static final String LOGTAG = "WidgetTileLayer";
+
+    private int[] mTextureIDs;
+    private CairoImage mImage;
+
+    public WidgetTileLayer(CairoImage image) {
+        mImage = image;
+    }
+
+    protected boolean initialized() { return mTextureIDs != null; }
+
+    @Override
+    public IntSize getSize() { return mImage.getSize(); }
+
+    protected void bindAndSetGLParameters() {
+        GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, mTextureIDs[0]);
+        GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_NEAREST);
+        GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_LINEAR);
+    }
+
+    @Override
+    protected void finalize() throws Throwable {
+        if (mTextureIDs != null)
+            TextureReaper.get().add(mTextureIDs);
+    }
+
+    @Override
+    protected boolean performUpdates(RenderContext context) {
+        super.performUpdates(context);
+
+        if (mTextureIDs == null) {
+            mTextureIDs = new int[1];
+            GLES20.glGenTextures(1, mTextureIDs, 0);
+        }
+
+        bindAndSetGLParameters();
+        LOKitShell.bindWidgetTexture();
+
+        return true;
+    }
+
+    @Override
+    public void draw(RenderContext context) {
+        // mTextureIDs may be null here during startup if Layer.java's draw method
+        // failed to acquire the transaction lock and call performUpdates.
+        if (!initialized())
+            return;
+
+        GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, mTextureIDs[0]);
+
+        RectF bounds;
+        int[] cropRect;
+        IntSize size = getSize();
+        RectF viewport = context.viewport;
+
+        bounds = getBounds(context, new FloatSize(size));
+        cropRect = new int[] { 0, 0, size.width, size.height };
+        bounds.offset(-viewport.left, -viewport.top);
+
+        float top = viewport.height() - (bounds.top + bounds.height());
+
+        // There may be errors from a previous GL call, so clear them first because
+        // we want to check for one below
+        while (GLES20.glGetError() != GLES20.GL_NO_ERROR);
+
+        float[] coords = {
+                //x, y, z, texture_x, texture_y
+                bounds.left/viewport.width(), top/viewport.height(), 0,
+                cropRect[0]/size.width, cropRect[1]/size.height,
+
+                bounds.left/viewport.width(), (top+bounds.height())/viewport.height(), 0,
+                cropRect[0]/size.width, cropRect[3]/size.height,
+
+                (bounds.left+bounds.width())/viewport.width(), top/viewport.height(), 0,
+                cropRect[2]/size.width, cropRect[1]/size.height,
+
+                (bounds.left+bounds.width())/viewport.width(), (top+bounds.height())/viewport.height(),
+                0,
+                cropRect[2]/size.width, cropRect[3]/size.height
+        };
+
+        // Get the buffer and handles from the context
+        FloatBuffer coordBuffer = context.coordBuffer;
+        int positionHandle = context.positionHandle;
+        int textureHandle = context.textureHandle;
+
+        // Make sure we are at position zero in the buffer in case other draw methods did not clean
+        // up after themselves
+        coordBuffer.position(0);
+        coordBuffer.put(coords);
+
+        // Vertex coordinates are x,y,z starting at position 0 into the buffer.
+        coordBuffer.position(0);
+        GLES20.glVertexAttribPointer(positionHandle, 3, GLES20.GL_FLOAT, false, 20, coordBuffer);
+
+        // Texture coordinates are texture_x, texture_y starting at position 3 into the buffer.
+        coordBuffer.position(3);
+        GLES20.glVertexAttribPointer(textureHandle, 2, GLES20.GL_FLOAT, false, 20, coordBuffer);
+        GLES20.glDrawArrays(GLES20.GL_TRIANGLE_STRIP, 0, 4);
+
+        int error = GLES20.glGetError();
+        if (error != GLES20.GL_NO_ERROR) {
+            Log.i(LOGTAG, "Failed to draw texture: " + error);
+        }
+    }
+}
+
diff --git a/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/ui/Axis.java b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/ui/Axis.java
new file mode 100644
index 000000000000..8c0fce4c73b3
--- /dev/null
+++ b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/ui/Axis.java
@@ -0,0 +1,271 @@
+/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
+ * ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Mozilla Android code.
+ *
+ * The Initial Developer of the Original Code is Mozilla Foundation.
+ * Portions created by the Initial Developer are Copyright (C) 2012
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Patrick Walton <pcwalton@mozilla.com>
+ *   Kartikaya Gupta <kgupta@mozilla.com>
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+package org.mozilla.gecko.ui;
+
+import org.mozilla.gecko.util.FloatUtils;
+
+/**
+ * This class represents the physics for one axis of movement (i.e. either
+ * horizontal or vertical). It tracks the different properties of movement
+ * like displacement, velocity, viewport dimensions, etc. pertaining to
+ * a particular axis.
+ */
+abstract class Axis {
+    // This fraction of velocity remains after every animation frame when the velocity is low.
+    private static final float FRICTION_SLOW = 0.85f;
+    // This fraction of velocity remains after every animation frame when the velocity is high.
+    private static final float FRICTION_FAST = 0.97f;
+    // Below this velocity (in pixels per frame), the friction starts increasing from FRICTION_FAST
+    // to FRICTION_SLOW.
+    private static final float VELOCITY_THRESHOLD = 10.0f;
+    // The maximum velocity change factor between events, per ms, in %.
+    // Direction changes are excluded.
+    private static final float MAX_EVENT_ACCELERATION = 0.012f;
+
+    // The rate of deceleration when the surface has overscrolled.
+    private static final float OVERSCROLL_DECEL_RATE = 0.04f;
+    // The percentage of the surface which can be overscrolled before it must snap back.
+    private static final float SNAP_LIMIT = 0.75f;
+
+    // The minimum amount of space that must be present for an axis to be considered scrollable,
+    // in pixels.
+    private static final float MIN_SCROLLABLE_DISTANCE = 0.5f;
+    // The number of milliseconds per frame assuming 60 fps
+    private static final float MS_PER_FRAME = 1000.0f / 60.0f;
+
+    private enum FlingStates {
+        STOPPED,
+        PANNING,
+        FLINGING,
+    }
+
+    private enum Overscroll {
+        NONE,
+        MINUS,      // Overscrolled in the negative direction
+        PLUS,       // Overscrolled in the positive direction
+        BOTH,       // Overscrolled in both directions (page is zoomed to smaller than screen)
+    }
+
+    private final SubdocumentScrollHelper mSubscroller;
+
+    private float mFirstTouchPos;           /* Position of the first touch event on the current drag. */
+    private float mTouchPos;                /* Position of the most recent touch event on the current drag. */
+    private float mLastTouchPos;            /* Position of the touch event before touchPos. */
+    private float mVelocity;                /* Velocity in this direction; pixels per animation frame. */
+    public boolean mScrollingDisabled;      /* Whether movement on this axis is locked. */
+    private boolean mDisableSnap;           /* Whether overscroll snapping is disabled. */
+    private float mDisplacement;
+
+    private FlingStates mFlingState;        /* The fling state we're in on this axis. */
+
+    protected abstract float getOrigin();
+    protected abstract float getViewportLength();
+    protected abstract float getPageLength();
+
+    Axis(SubdocumentScrollHelper subscroller) {
+        mSubscroller = subscroller;
+    }
+
+    private float getViewportEnd() {
+        return getOrigin() + getViewportLength();
+    }
+
+    void startTouch(float pos) {
+        mVelocity = 0.0f;
+        mScrollingDisabled = false;
+        mFirstTouchPos = mTouchPos = mLastTouchPos = pos;
+    }
+
+    float panDistance(float currentPos) {
+        return currentPos - mFirstTouchPos;
+    }
+
+    void setScrollingDisabled(boolean disabled) {
+        mScrollingDisabled = disabled;
+    }
+
+    void saveTouchPos() {
+        mLastTouchPos = mTouchPos;
+    }
+
+    void updateWithTouchAt(float pos, float timeDelta) {
+        float newVelocity = (mTouchPos - pos) / timeDelta * MS_PER_FRAME;
+
+        // If there's a direction change, or current velocity is very low,
+        // allow setting of the velocity outright. Otherwise, use the current
+        // velocity and a maximum change factor to set the new velocity.
+        boolean curVelocityIsLow = Math.abs(mVelocity) < 1.0f;
+        boolean directionChange = (mVelocity > 0) != (newVelocity > 0);
+        if (curVelocityIsLow || (directionChange && !FloatUtils.fuzzyEquals(newVelocity, 0.0f))) {
+            mVelocity = newVelocity;
+        } else {
+            float maxChange = Math.abs(mVelocity * timeDelta * MAX_EVENT_ACCELERATION);
+            mVelocity = Math.min(mVelocity + maxChange, Math.max(mVelocity - maxChange, newVelocity));
+        }
+
+        mTouchPos = pos;
+    }
+
+    boolean overscrolled() {
+        return getOverscroll() != Overscroll.NONE;
+    }
+
+    private Overscroll getOverscroll() {
+        boolean minus = (getOrigin() < 0.0f);
+        boolean plus = (getViewportEnd() > getPageLength());
+        if (minus && plus) {
+            return Overscroll.BOTH;
+        } else if (minus) {
+            return Overscroll.MINUS;
+        } else if (plus) {
+            return Overscroll.PLUS;
+        } else {
+            return Overscroll.NONE;
+        }
+    }
+
+    // Returns the amount that the page has been overscrolled. If the page hasn't been
+    // overscrolled on this axis, returns 0.
+    private float getExcess() {
+        switch (getOverscroll()) {
+            case MINUS:     return -getOrigin();
+            case PLUS:      return getViewportEnd() - getPageLength();
+            case BOTH:      return getViewportEnd() - getPageLength() - getOrigin();
+            default:        return 0.0f;
+        }
+    }
+
+    /*
+     * Returns true if the page is zoomed in to some degree along this axis such that scrolling is
+     * possible and this axis has not been scroll locked while panning. Otherwise, returns false.
+     */
+    private boolean scrollable() {
+        return getViewportLength() <= getPageLength() - MIN_SCROLLABLE_DISTANCE &&
+                !mScrollingDisabled;
+    }
+
+    /*
+     * Returns the resistance, as a multiplier, that should be taken into account when
+     * tracking or pinching.
+     */
+    float getEdgeResistance() {
+        float excess = getExcess();
+        if (excess > 0.0f) {
+            // excess can be greater than viewport length, but the resistance
+            // must never drop below 0.0
+            return Math.max(0.0f, SNAP_LIMIT - excess / getViewportLength());
+        }
+        return 1.0f;
+    }
+
+    /* Returns the velocity. If the axis is locked, returns 0. */
+    float getRealVelocity() {
+        return scrollable() ? mVelocity : 0f;
+    }
+
+    void startPan() {
+        mFlingState = FlingStates.PANNING;
+    }
+
+    void startFling(boolean stopped) {
+        mDisableSnap = mSubscroller.scrolling();
+
+        if (stopped) {
+            mFlingState = FlingStates.STOPPED;
+        } else {
+            mFlingState = FlingStates.FLINGING;
+        }
+    }
+
+    /* Advances a fling animation by one step. */
+    boolean advanceFling() {
+        if (mFlingState != FlingStates.FLINGING) {
+            return false;
+        }
+        if (mSubscroller.scrolling() && !mSubscroller.lastScrollSucceeded()) {
+            // if the subdocument stopped scrolling, it's because it reached the end
+            // of the subdocument. we don't do overscroll on subdocuments, so there's
+            // no point in continuing this fling.
+            return false;
+        }
+
+        float excess = getExcess();
+        if (mDisableSnap || FloatUtils.fuzzyEquals(excess, 0.0f)) {
+            // If we aren't overscrolled, just apply friction.
+            if (Math.abs(mVelocity) >= VELOCITY_THRESHOLD) {
+                mVelocity *= FRICTION_FAST;
+            } else {
+                float t = mVelocity / VELOCITY_THRESHOLD;
+                mVelocity *= FloatUtils.interpolate(FRICTION_SLOW, FRICTION_FAST, t);
+            }
+        } else {
+            // Otherwise, decrease the velocity linearly.
+            float elasticity = 1.0f - excess / (getViewportLength() * SNAP_LIMIT);
+            if (getOverscroll() == Overscroll.MINUS) {
+                mVelocity = Math.min((mVelocity + OVERSCROLL_DECEL_RATE) * elasticity, 0.0f);
+            } else { // must be Overscroll.PLUS
+                mVelocity = Math.max((mVelocity - OVERSCROLL_DECEL_RATE) * elasticity, 0.0f);
+            }
+        }
+
+        return true;
+    }
+
+    void stopFling() {
+        mVelocity = 0.0f;
+        mFlingState = FlingStates.STOPPED;
+    }
+
+    // Performs displacement of the viewport position according to the current velocity.
+    void displace() {
+        if (!mSubscroller.scrolling() && !scrollable())
+            return;
+
+        if (mFlingState == FlingStates.PANNING)
+            mDisplacement += (mLastTouchPos - mTouchPos) * getEdgeResistance();
+        else
+            mDisplacement += mVelocity;
+    }
+
+    float resetDisplacement() {
+        float d = mDisplacement;
+        mDisplacement = 0.0f;
+        return d;
+    }
+}
diff --git a/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/ui/PanZoomController.java b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/ui/PanZoomController.java
new file mode 100644
index 000000000000..c3cacccf805e
--- /dev/null
+++ b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/ui/PanZoomController.java
@@ -0,0 +1,921 @@
+/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
+ * ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Mozilla Android code.
+ *
+ * The Initial Developer of the Original Code is Mozilla Foundation.
+ * Portions created by the Initial Developer are Copyright (C) 2009-2012
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Patrick Walton <pcwalton@mozilla.com>
+ *   Kartikaya Gupta <kgupta@mozilla.com>
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+package org.mozilla.gecko.ui;
+
+import org.json.JSONObject;
+import org.json.JSONException;
+import org.libreoffice.LOKitShell;
+import org.libreoffice.LibreOfficeMainActivity;
+import org.mozilla.gecko.gfx.FloatSize;
+import org.mozilla.gecko.gfx.LayerController;
+import org.mozilla.gecko.gfx.PointUtils;
+import org.mozilla.gecko.gfx.ViewportMetrics;
+import org.mozilla.gecko.util.FloatUtils;
+import org.mozilla.gecko.GeckoEventListener;
+import android.graphics.PointF;
+import android.graphics.RectF;
+import android.util.FloatMath;
+import android.util.Log;
+import android.view.GestureDetector;
+import android.view.MotionEvent;
+import java.util.Timer;
+import java.util.TimerTask;
+
+/*
+ * Handles the kinetic scrolling and zooming physics for a layer controller.
+ *
+ * Many ideas are from Joe Hewitt's Scrollability:
+ *   https://github.com/joehewitt/scrollability/
+ */
+public class PanZoomController
+        extends GestureDetector.SimpleOnGestureListener
+        implements SimpleScaleGestureDetector.SimpleScaleGestureListener, GeckoEventListener
+{
+    private static final String LOGTAG = "GeckoPanZoomController";
+
+    private static String MESSAGE_ZOOM_RECT = "Browser:ZoomToRect";
+    private static String MESSAGE_ZOOM_PAGE = "Browser:ZoomToPageWidth";
+
+    // Animation stops if the velocity is below this value when overscrolled or panning.
+    private static final float STOPPED_THRESHOLD = 4.0f;
+
+    // Animation stops is the velocity is below this threshold when flinging.
+    private static final float FLING_STOPPED_THRESHOLD = 0.1f;
+
+    // The distance the user has to pan before we recognize it as such (e.g. to avoid 1-pixel pans
+    // between the touch-down and touch-up of a click). In units of density-independent pixels.
+    public static final float PAN_THRESHOLD = 1/16f * LOKitShell.getDpi();
+
+    // Angle from axis within which we stay axis-locked
+    private static final double AXIS_LOCK_ANGLE = Math.PI / 6.0; // 30 degrees
+
+    // The maximum amount we allow you to zoom into a page
+    private static final float MAX_ZOOM = 4.0f;
+
+    /* 16 precomputed frames of the _ease-out_ animation from the CSS Transitions specification. */
+    private static final float[] EASE_OUT_ANIMATION_FRAMES = {
+            0.00000f,   /* 0 */
+            0.10211f,   /* 1 */
+            0.19864f,   /* 2 */
+            0.29043f,   /* 3 */
+            0.37816f,   /* 4 */
+            0.46155f,   /* 5 */
+            0.54054f,   /* 6 */
+            0.61496f,   /* 7 */
+            0.68467f,   /* 8 */
+            0.74910f,   /* 9 */
+            0.80794f,   /* 10 */
+            0.86069f,   /* 11 */
+            0.90651f,   /* 12 */
+            0.94471f,   /* 13 */
+            0.97401f,   /* 14 */
+            0.99309f,   /* 15 */
+    };
+
+    private enum PanZoomState {
+        NOTHING,        /* no touch-start events received */
+        FLING,          /* all touches removed, but we're still scrolling page */
+        TOUCHING,       /* one touch-start event received */
+        PANNING_LOCKED, /* touch-start followed by move (i.e. panning with axis lock) */
+        PANNING,        /* panning without axis lock */
+        PANNING_HOLD,   /* in panning, but not moving.
+                         * similar to TOUCHING but after starting a pan */
+        PANNING_HOLD_LOCKED, /* like PANNING_HOLD, but axis lock still in effect */
+        PINCHING,       /* nth touch-start, where n > 1. this mode allows pan and zoom */
+        ANIMATED_ZOOM   /* animated zoom to a new rect */
+    }
+
+    private final LayerController mController;
+    private final SubdocumentScrollHelper mSubscroller;
+    private final Axis mX;
+    private final Axis mY;
+
+    private Thread mMainThread;
+
+    /* The timer that handles flings or bounces. */
+    private Timer mAnimationTimer;
+    /* The runnable being scheduled by the animation timer. */
+    private AnimationRunnable mAnimationRunnable;
+    /* The zoom focus at the first zoom event (in page coordinates). */
+    private PointF mLastZoomFocus;
+    /* The time the last motion event took place. */
+    private long mLastEventTime;
+    /* Current state the pan/zoom UI is in. */
+    private PanZoomState mState;
+
+    public PanZoomController(LayerController controller) {
+        mController = controller;
+        mSubscroller = new SubdocumentScrollHelper(this);
+        mX = new AxisX(mSubscroller);
+        mY = new AxisY(mSubscroller);
+
+        mMainThread = LibreOfficeMainActivity.mAppContext.getMainLooper().getThread();
+        checkMainThread();
+
+        mState = PanZoomState.NOTHING;
+
+        //GeckoAppShell.registerGeckoEventListener(MESSAGE_ZOOM_RECT, this);
+        //GeckoAppShell.registerGeckoEventListener(MESSAGE_ZOOM_PAGE, this);
+    }
+
+    // for debugging bug 713011; it can be taken out once that is resolved.
+    private void checkMainThread() {
+        if (mMainThread != Thread.currentThread()) {
+            // log with full stack trace
+            Log.e(LOGTAG, "Uh-oh, we're running on the wrong thread!", new Exception());
+        }
+    }
+
+    public void handleMessage(String event, JSONObject message) {
+        Log.i(LOGTAG, "Got message: " + event);
+        try {
+            if (MESSAGE_ZOOM_RECT.equals(event)) {
+                float x = (float)message.getDouble("x");
+                float y = (float)message.getDouble("y");
+                final RectF zoomRect = new RectF(x, y,
+                        x + (float)message.getDouble("w"),
+                        y + (float)message.getDouble("h"));
+                mController.post(new Runnable() {
+                    public void run() {
+                        animatedZoomTo(zoomRect);
+                    }
+                });
+            } else if (MESSAGE_ZOOM_PAGE.equals(event)) {
+                FloatSize pageSize = mController.getPageSize();
+
+                RectF viewableRect = mController.getViewport();
+                float y = viewableRect.top;
+                // attempt to keep zoom keep focused on the center of the viewport
+                float newHeight = viewableRect.height() * pageSize.width / viewableRect.width();
+                float dh = viewableRect.height() - newHeight; // increase in the height
+                final RectF r = new RectF(0.0f,
+                        y + dh/2,
+                        pageSize.width,
+                        y + dh/2 + newHeight);
+                mController.post(new Runnable() {
+                    public void run() {
+                        animatedZoomTo(r);
+                    }
+                });
+            }
+        } catch (Exception e) {
+            Log.e(LOGTAG, "Exception handling message \"" + event + "\":", e);
+        }
+    }
+
+    public boolean onTouchEvent(MotionEvent event) {
+        switch (event.getAction() & MotionEvent.ACTION_MASK) {
+            case MotionEvent.ACTION_DOWN:   return onTouchStart(event);
+            case MotionEvent.ACTION_MOVE:   return onTouchMove(event);
+            case MotionEvent.ACTION_UP:     return onTouchEnd(event);
+            case MotionEvent.ACTION_CANCEL: return onTouchCancel(event);
+            default:                        return false;
+        }
+    }
+
+    /** This function must be called from the UI thread. */
+    public void abortAnimation() {
+        checkMainThread();
+        // this happens when gecko changes the viewport on us or if the device is rotated.
+        // if that's the case, abort any animation in progress and re-zoom so that the page
+        // snaps to edges. for other cases (where the user's finger(s) are down) don't do
+        // anything special.
+        switch (mState) {
+            case FLING:
+                mX.stopFling();
+                mY.stopFling();
+                mState = PanZoomState.NOTHING;
+                // fall through
+            case ANIMATED_ZOOM:
+                // the zoom that's in progress likely makes no sense any more (such as if
+                // the screen orientation changed) so abort it
+                // fall through
+            case NOTHING:
+                // Don't do animations here; they're distracting and can cause flashes on page
+                // transitions.
+                mController.setViewportMetrics(getValidViewportMetrics());
+                mController.notifyLayerClientOfGeometryChange();
+                break;
+        }
+    }
+
+    /** This must be called on the UI thread. */
+    public void pageSizeUpdated() {
+        if (mState == PanZoomState.NOTHING) {
+            ViewportMetrics validated = getValidViewportMetrics();
+            if (! mController.getViewportMetrics().fuzzyEquals(validated)) {
+                // page size changed such that we are now in overscroll. snap to the
+                // the nearest valid viewport
+                mController.setViewportMetrics(validated);
+                mController.notifyLayerClientOfGeometryChange();
+            }
+        }
+    }
+
+    /*
+     * Panning/scrolling
+     */
+
+    private boolean onTouchStart(MotionEvent event) {
+        Log.d(LOGTAG, "onTouchStart in state " + mState);
+        // user is taking control of movement, so stop
+        // any auto-movement we have going
+        stopAnimationTimer();
+        mSubscroller.cancel();
+
+        switch (mState) {
+            case ANIMATED_ZOOM:
+                return false;
+            case FLING:
+            case NOTHING:
+                startTouch(event.getX(0), event.getY(0), event.getEventTime());
+                return false;
+            case TOUCHING:
+            case PANNING:
+            case PANNING_LOCKED:
+            case PANNING_HOLD:
+            case PANNING_HOLD_LOCKED:
+            case PINCHING:
+                Log.e(LOGTAG, "Received impossible touch down while in " + mState);
+                return false;
+        }
+        Log.e(LOGTAG, "Unhandled case " + mState + " in onTouchStart");
+        return false;
+    }
+
+    private boolean onTouchMove(MotionEvent event) {
+        Log.d(LOGTAG, "onTouchMove in state " + mState);
+
+        switch (mState) {
+            case NOTHING:
+            case FLING:
+                // should never happen
+                Log.e(LOGTAG, "Received impossible touch move while in " + mState);
+                return false;
+
+            case TOUCHING:
+                if (panDistance(event) < PAN_THRESHOLD) {
+                    return false;
+                }
+                cancelTouch();
+                startPanning(event.getX(0), event.getY(0), event.getEventTime());
+                //GeckoApp.mAppContext.hidePlugins(false /* don't hide layers */);
+                //GeckoApp.mAutoCompletePopup.hide();
+                track(event);
+                return true;
+
+            case PANNING_HOLD_LOCKED:
+                //GeckoApp.mAutoCompletePopup.hide();
+                mState = PanZoomState.PANNING_LOCKED;
+                // fall through
+            case PANNING_LOCKED:
+                track(event);
+                return true;
+
+            case PANNING_HOLD:
+                //GeckoApp.mAutoCompletePopup.hide();
+                mState = PanZoomState.PANNING;
+                // fall through
+            case PANNING:
+                track(event);
+                return true;
+
+            case ANIMATED_ZOOM:
+            case PINCHING:
+                // scale gesture listener will handle this
+                return false;
+        }
+        Log.e(LOGTAG, "Unhandled case " + mState + " in onTouchMove");
+        return false;
+    }
+
+    private boolean onTouchEnd(MotionEvent event) {
+        Log.d(LOGTAG, "onTouchEnd in " + mState);
+
+        switch (mState) {
+            case NOTHING:
+            case FLING:
+                // should never happen
+                Log.e(LOGTAG, "Received impossible touch end while in " + mState);
+                return false;
+            case TOUCHING:
+                mState = PanZoomState.NOTHING;
+                // the switch into TOUCHING might have happened while the page was
+                // snapping back after overscroll. we need to finish the snap if that
+                // was the case
+                bounce();
+                return false;
+            case PANNING:
+            case PANNING_LOCKED:
+            case PANNING_HOLD:
+            case PANNING_HOLD_LOCKED:
+                mState = PanZoomState.FLING;
+                fling();
+                return true;
+            case PINCHING:
+                mState = PanZoomState.NOTHING;
+                return true;
+            case ANIMATED_ZOOM:
+                return false;
+        }
+        Log.e(LOGTAG, "Unhandled case " + mState + " in onTouchEnd");
+        return false;
+    }
+
+    private boolean onTouchCancel(MotionEvent event) {
+        Log.d(LOGTAG, "onTouchCancel in " + mState);
+
+        mState = PanZoomState.NOTHING;
+        // ensure we snap back if we're overscrolled
+        bounce();
+        return false;
+    }
+
+    private void startTouch(float x, float y, long time) {
+        mX.startTouch(x);
+        mY.startTouch(y);
+        mState = PanZoomState.TOUCHING;
+        mLastEventTime = time;
+    }
+
+    private void startPanning(float x, float y, long time) {
+        float dx = mX.panDistance(x);
+        float dy = mY.panDistance(y);
+        double angle = Math.atan2(dy, dx); // range [-pi, pi]
+        angle = Math.abs(angle); // range [0, pi]
+
+        // When the touch move breaks through the pan threshold, reposition the touch down origin
+        // so the page won't jump when we start panning.
+        mX.startTouch(x);
+        mY.startTouch(y);
+        mLastEventTime = time;
+
+        if (angle < AXIS_LOCK_ANGLE || angle > (Math.PI - AXIS_LOCK_ANGLE)) {
+            mY.setScrollingDisabled(true);
+            mState = PanZoomState.PANNING_LOCKED;
+        } else if (Math.abs(angle - (Math.PI / 2)) < AXIS_LOCK_ANGLE) {
+            mX.setScrollingDisabled(true);
+            mState = PanZoomState.PANNING_LOCKED;
+        } else {
+            mState = PanZoomState.PANNING;
+        }
+    }
+
+    private float panDistance(MotionEvent move) {
+        float dx = mX.panDistance(move.getX(0));
+        float dy = mY.panDistance(move.getY(0));
+        return FloatMath.sqrt(dx * dx + dy * dy);
+    }
+
+    private void track(float x, float y, long time) {
+        float timeDelta = (float)(time - mLastEventTime);
+        if (FloatUtils.fuzzyEquals(timeDelta, 0)) {
+            // probably a duplicate event, ignore it. using a zero timeDelta will mess
+            // up our velocity
+            return;
+        }
+        mLastEventTime = time;
+
+        mX.updateWithTouchAt(x, timeDelta);
+        mY.updateWithTouchAt(y, timeDelta);
+    }
+
+    private void track(MotionEvent event) {
+        mX.saveTouchPos();
+        mY.saveTouchPos();
+
+        for (int i = 0; i < event.getHistorySize(); i++) {
+            track(event.getHistoricalX(0, i),
+                    event.getHistoricalY(0, i),
+                    event.getHistoricalEventTime(i));
+        }
+        track(event.getX(0), event.getY(0), event.getEventTime());
+
+        if (stopped()) {
+            if (mState == PanZoomState.PANNING) {
+                mState = PanZoomState.PANNING_HOLD;
+            } else if (mState == PanZoomState.PANNING_LOCKED) {
+                mState = PanZoomState.PANNING_HOLD_LOCKED;
+            } else {
+                // should never happen, but handle anyway for robustness
+                Log.e(LOGTAG, "Impossible case " + mState + " when stopped in track");
+                mState = PanZoomState.PANNING_HOLD_LOCKED;
+            }
+        }
+
+        mX.startPan();
+        mY.startPan();
+        updatePosition();
+    }
+
+    private void fling() {
+        updatePosition();
+
+        stopAnimationTimer();
+
+        boolean stopped = stopped();
+        mX.startFling(stopped);
+        mY.startFling(stopped);
+
+        startAnimationTimer(new FlingRunnable());
+    }
+
+    /* Performs a bounce-back animation to the given viewport metrics. */
+    private void bounce(ViewportMetrics metrics) {
+        stopAnimationTimer();
+
+        ViewportMetrics bounceStartMetrics = new ViewportMetrics(mController.getViewportMetrics());
+        if (bounceStartMetrics.fuzzyEquals(metrics)) {
+            mState = PanZoomState.NOTHING;
+            return;
+        }
+
+        mState = PanZoomState.FLING;
+        Log.d(LOGTAG, "end bounce at " + metrics);
+
+        startAnimationTimer(new BounceRunnable(bounceStartMetrics, metrics));
+    }
+
+    /* Performs a bounce-back animation to the nearest valid viewport metrics. */
+    private void bounce() {
+        bounce(getValidViewportMetrics());
+    }
+
+    /* Starts the fling or bounce animation. */
+    private void startAnimationTimer(final AnimationRunnable runnable) {
+        if (mAnimationTimer != null) {
+            Log.e(LOGTAG, "Attempted to start a new fling without canceling the old one!");
+            stopAnimationTimer();
+        }
+
+        //GeckoApp.mAppContext.hidePlugins(false /* don't hide layers */);
+
+        mAnimationTimer = new Timer("Animation Timer");
+        mAnimationRunnable = runnable;
+        mAnimationTimer.scheduleAtFixedRate(new TimerTask() {
+            @Override
+            public void run() { mController.post(runnable); }
+        }, 0, 1000L/60L);
+    }
+
+    /* Stops the fling or bounce animation. */
+    private void stopAnimationTimer() {
+        if (mAnimationTimer != null) {
+            mAnimationTimer.cancel();
+            mAnimationTimer = null;
+        }
+        if (mAnimationRunnable != null) {
+            mAnimationRunnable.terminate();
+            mAnimationRunnable = null;
+        }
+
+        //GeckoApp.mAppContext.showPlugins();
+    }
+
+    private float getVelocity() {
+        float xvel = mX.getRealVelocity();
+        float yvel = mY.getRealVelocity();
+        return FloatMath.sqrt(xvel * xvel + yvel * yvel);
+    }
+
+    private boolean stopped() {
+        return getVelocity() < STOPPED_THRESHOLD;
+    }
+
+    PointF getDisplacement() {
+        return new PointF(mX.resetDisplacement(), mY.resetDisplacement());
+    }
+
+    private void updatePosition() {
+        mX.displace();
+        mY.displace();
+        PointF displacement = getDisplacement();
+        if (! mSubscroller.scrollBy(displacement)) {
+            synchronized (mController) {
+                mController.scrollBy(displacement);
+            }
+        }
+    }
+
+    private abstract class AnimationRunnable implements Runnable {
+        private boolean mAnimationTerminated;
+
+        /* This should always run on the UI thread */
+        public final void run() {
+            /*
+             * Since the animation timer queues this runnable on the UI thread, it
+             * is possible that even when the animation timer is cancelled, there
+             * are multiple instances of this queued, so we need to have another
+             * mechanism to abort. This is done by using the mAnimationTerminated flag.
+             */
+            if (mAnimationTerminated) {
+                return;
+            }
+            animateFrame();
+        }
+
+        protected abstract void animateFrame();
+
+        /* This should always run on the UI thread */
+        protected final void terminate() {
+            mAnimationTerminated = true;
+        }
+    }
+
+    /* The callback that performs the bounce animation. */
+    private class BounceRunnable extends AnimationRunnable {
+        /* The current frame of the bounce-back animation */
+        private int mBounceFrame;
+        /*
+         * The viewport metrics that represent the start and end of the bounce-back animation,
+         * respectively.
+         */
+        private ViewportMetrics mBounceStartMetrics;
+        private ViewportMetrics mBounceEndMetrics;
+
+        BounceRunnable(ViewportMetrics startMetrics, ViewportMetrics endMetrics) {
+            mBounceStartMetrics = startMetrics;
+            mBounceEndMetrics = endMetrics;
+        }
+
+        protected void animateFrame() {
+            /*
+             * The pan/zoom controller might have signaled to us that it wants to abort the
+             * animation by setting the state to PanZoomState.NOTHING. Handle this case and bail
+             * out.
+             */
+            if (mState != PanZoomState.FLING) {
+                finishAnimation();
+                return;
+            }
+
+            /* Perform the next frame of the bounce-back animation. */
+            if (mBounceFrame < EASE_OUT_ANIMATION_FRAMES.length) {
+                advanceBounce();
+                return;
+            }
+
+            /* Finally, if there's nothing else to do, complete the animation and go to sleep. */
+            finishBounce();
+            finishAnimation();
+            mState = PanZoomState.NOTHING;
+        }
+
+        /* Performs one frame of a bounce animation. */
+        private void advanceBounce() {
+            synchronized (mController) {
+                float t = EASE_OUT_ANIMATION_FRAMES[mBounceFrame];
+                ViewportMetrics newMetrics = mBounceStartMetrics.interpolate(mBounceEndMetrics, t);
+                mController.setViewportMetrics(newMetrics);
+                mController.notifyLayerClientOfGeometryChange();
+                mBounceFrame++;
+            }
+        }
+
+        /* Concludes a bounce animation and snaps the viewport into place. */
+        private void finishBounce() {
+            synchronized (mController) {
+                mController.setViewportMetrics(mBounceEndMetrics);
+                mController.notifyLayerClientOfGeometryChange();
+                mBounceFrame = -1;
+            }
+        }
+    }
+
+    // The callback that performs the fling animation.
+    private class FlingRunnable extends AnimationRunnable {
+        protected void animateFrame() {
+            /*
+             * The pan/zoom controller might have signaled to us that it wants to abort the
+             * animation by setting the state to PanZoomState.NOTHING. Handle this case and bail
+             * out.
+             */
+            if (mState != PanZoomState.FLING) {
+                finishAnimation();
+                return;
+            }
+
+            /* Advance flings, if necessary. */
+            boolean flingingX = mX.advanceFling();
+            boolean flingingY = mY.advanceFling();
+
+            boolean overscrolled = (mX.overscrolled() || mY.overscrolled());
+
+            /* If we're still flinging in any direction, update the origin. */
+            if (flingingX || flingingY) {
+                updatePosition();
+
+                /*
+                 * Check to see if we're still flinging with an appreciable velocity. The threshold is
+                 * higher in the case of overscroll, so we bounce back eagerly when overscrolling but
+                 * coast smoothly to a stop when not. In other words, require a greater velocity to
+                 * maintain the fling once we enter overscroll.
+                 */
+                float threshold = (overscrolled && !mSubscroller.scrolling() ? STOPPED_THRESHOLD : FLING_STOPPED_THRESHOLD);
+                if (getVelocity() >= threshold) {
+                    // we're still flinging
+                    return;
+                }
+
+                mX.stopFling();
+                mY.stopFling();
+            }
+
+            /* Perform a bounce-back animation if overscrolled. */
+            if (overscrolled) {
+                bounce();
+            } else {
+                finishAnimation();
+                mState = PanZoomState.NOTHING;
+            }
+        }
+    }
+
+    private void finishAnimation() {
+        checkMainThread();
+
+        Log.d(LOGTAG, "Finishing animation at " + mController.getViewportMetrics());
+        stopAnimationTimer();
+
+        // Force a viewport synchronisation
+        //GeckoApp.mAppContext.showPlugins();
+        mController.setForceRedraw();
+        mController.notifyLayerClientOfGeometryChange();
+    }
+
+    /* Returns the nearest viewport metrics with no overscroll visible. */
+    private ViewportMetrics getValidViewportMetrics() {
+        return getValidViewportMetrics(new ViewportMetrics(mController.getViewportMetrics()));
+    }
+
+    private ViewportMetrics getValidViewportMetrics(ViewportMetrics viewportMetrics) {
+        Log.d(LOGTAG, "generating valid viewport using " + viewportMetrics);
+
+        /* First, we adjust the zoom factor so that we can make no overscrolled area visible. */
+        float zoomFactor = viewportMetrics.getZoomFactor();
+        FloatSize pageSize = viewportMetrics.getPageSize();
+        RectF viewport = viewportMetrics.getViewport();
+
+        float focusX = viewport.width() / 2.0f;
+        float focusY = viewport.height() / 2.0f;
+        float minZoomFactor = 0.0f;
+        if (viewport.width() > pageSize.width && pageSize.width > 0) {
+            float scaleFactor = viewport.width() / pageSize.width;
+            minZoomFactor = Math.max(minZoomFactor, zoomFactor * scaleFactor);
+            focusX = 0.0f;
+        }
+        if (viewport.height() > pageSize.height && pageSize.height > 0) {
+            float scaleFactor = viewport.height() / pageSize.height;
+            minZoomFactor = Math.max(minZoomFactor, zoomFactor * scaleFactor);
+            focusY = 0.0f;
+        }
+
+        if (!FloatUtils.fuzzyEquals(minZoomFactor, 0.0f)) {
+            // if one (or both) of the page dimensions is smaller than the viewport,
+            // zoom using the top/left as the focus on that axis. this prevents the
+            // scenario where, if both dimensions are smaller than the viewport, but
+            // by different scale factors, we end up scrolled to the end on one axis
+            // after applying the scale
+            PointF center = new PointF(focusX, focusY);
+            viewportMetrics.scaleTo(minZoomFactor, center);
+        } else if (zoomFactor > MAX_ZOOM) {
+            PointF center = new PointF(viewport.width() / 2.0f, viewport.height() / 2.0f);
+            viewportMetrics.scaleTo(MAX_ZOOM, center);
+        }
+
+        /* Now we pan to the right origin. */
+        viewportMetrics.setViewport(viewportMetrics.getClampedViewport());
+        Log.d(LOGTAG, "generated valid viewport as " + viewportMetrics);
+
+        return viewportMetrics;
+    }
+
+    private class AxisX extends Axis {
+        AxisX(SubdocumentScrollHelper subscroller) { super(subscroller); }
+        @Override
+        public float getOrigin() { return mController.getOrigin().x; }
+        @Override
+        protected float getViewportLength() { return mController.getViewportSize().width; }
+        @Override
+        protected float getPageLength() { return mController.getPageSize().width; }
+    }
+
+    private class AxisY extends Axis {
+        AxisY(SubdocumentScrollHelper subscroller) { super(subscroller); }
+        @Override
+        public float getOrigin() { return mController.getOrigin().y; }
+        @Override
+        protected float getViewportLength() { return mController.getViewportSize().height; }
+        @Override
+        protected float getPageLength() { return mController.getPageSize().height; }
+    }
+
+    /*
+     * Zooming
+     */
+    @Override
+    public boolean onScaleBegin(SimpleScaleGestureDetector detector) {
+        Log.d(LOGTAG, "onScaleBegin in " + mState);
+
+        if (mState == PanZoomState.ANIMATED_ZOOM)
+            return false;
+
+        mState = PanZoomState.PINCHING;
+        mLastZoomFocus = new PointF(detector.getFocusX(), detector.getFocusY());
+        //GeckoApp.mAppContext.hidePlugins(false /* don't hide layers, only views */);
+        //GeckoApp.mAutoCompletePopup.hide();
+        cancelTouch();
+
+        return true;
+    }
+
+    @Override
+    public boolean onScale(SimpleScaleGestureDetector detector) {
+        Log.d(LOGTAG, "onScale in state " + mState);
+
+        if (mState == PanZoomState.ANIMATED_ZOOM)
+            return false;
+
+        float prevSpan = detector.getPreviousSpan();
+        if (FloatUtils.fuzzyEquals(prevSpan, 0.0f)) {
+            // let's eat this one to avoid setting the new zoom to infinity (bug 711453)
+            return true;
+        }
+
+        float spanRatio = detector.getCurrentSpan() / prevSpan;
+
+        /*
+         * Apply edge resistance if we're zoomed out smaller than the page size by scaling the zoom
+         * factor toward 1.0.
+         */
+        float resistance = Math.min(mX.getEdgeResistance(), mY.getEdgeResistance());
+        if (spanRatio > 1.0f)
+            spanRatio = 1.0f + (spanRatio - 1.0f) * resistance;
+        else
+            spanRatio = 1.0f - (1.0f - spanRatio) * resistance;
+
+        synchronized (mController) {
+            float newZoomFactor = mController.getZoomFactor() * spanRatio;
+            if (newZoomFactor >= MAX_ZOOM) {
+                // apply resistance when zooming past MAX_ZOOM,
+                // such that it asymptotically reaches MAX_ZOOM + 1.0
+                // but never exceeds that
+                float excessZoom = newZoomFactor - MAX_ZOOM;
+                excessZoom = 1.0f - (float)Math.exp(-excessZoom);
+                newZoomFactor = MAX_ZOOM + excessZoom;
+            }
+
+            mController.scrollBy(new PointF(mLastZoomFocus.x - detector.getFocusX(),
+                    mLastZoomFocus.y - detector.getFocusY()));
+            PointF focus = new PointF(detector.getFocusX(), detector.getFocusY());
+            mController.scaleWithFocus(newZoomFactor, focus);
+        }
+
+        mLastZoomFocus.set(detector.getFocusX(), detector.getFocusY());
+
+        return true;
+    }
+
+    @Override
+    public void onScaleEnd(SimpleScaleGestureDetector detector) {
+        Log.d(LOGTAG, "onScaleEnd in " + mState);
+
+        if (mState == PanZoomState.ANIMATED_ZOOM)
+            return;
+
+        // switch back to the touching state
+        startTouch(detector.getFocusX(), detector.getFocusY(), detector.getEventTime());
+
+        // Force a viewport synchronisation
+        //GeckoApp.mAppContext.showPlugins();
+        mController.setForceRedraw();
+        mController.notifyLayerClientOfGeometryChange();
+    }
+
+    public boolean getRedrawHint() {
+        return (mState != PanZoomState.PINCHING && mState != PanZoomState.ANIMATED_ZOOM);
+    }
+
+    private void sendPointToGecko(String event, MotionEvent motionEvent) {
+        String json;
+        try {
+            PointF point = new PointF(motionEvent.getX(), motionEvent.getY());
+            point = mController.convertViewPointToLayerPoint(point);
+            if (point == null) {
+                return;
+            }
+            json = PointUtils.toJSON(point).toString();
+        } catch (Exception e) {
+            Log.e(LOGTAG, "Unable to convert point to JSON for " + event, e);
+            return;
+        }
+
+        //GeckoAppShell.sendEventToGecko(GeckoEvent.createBroadcastEvent(event, json));
+    }
+
+    @Override
+    public void onLongPress(MotionEvent motionEvent) {
+        sendPointToGecko("Gesture:LongPress", motionEvent);
+    }
+
+    @Override
+    public boolean onDown(MotionEvent motionEvent) {
+        sendPointToGecko("Gesture:ShowPress", motionEvent);
+        return false;
+    }
+
+    @Override
+    public boolean onSingleTapConfirmed(MotionEvent motionEvent) {
+        //GeckoApp.mAutoCompletePopup.hide();
+        sendPointToGecko("Gesture:SingleTap", motionEvent);
+        return true;
+    }
+
+    @Override
+    public boolean onDoubleTap(MotionEvent motionEvent) {
+        sendPointToGecko("Gesture:DoubleTap", motionEvent);
+        return true;
+    }
+
+    public void cancelTouch() {
+        //GeckoEvent e = GeckoEvent.createBroadcastEvent("Gesture:CancelTouch", "");
+        //GeckoAppShell.sendEventToGecko(e);
+    }
+
+    private boolean animatedZoomTo(RectF zoomToRect) {
+        //GeckoApp.mAutoCompletePopup.hide();
+
+        mState = PanZoomState.ANIMATED_ZOOM;
+        final float startZoom = mController.getZoomFactor();
+
+        RectF viewport = mController.getViewport();
+        // 1. adjust the aspect ratio of zoomToRect to match that of the current viewport,
+        // enlarging as necessary (if it gets too big, it will get shrunk in the next step).
+        // while enlarging make sure we enlarge equally on both sides to keep the target rect
+        // centered.
+        float targetRatio = viewport.width() / viewport.height();
+        float rectRatio = zoomToRect.width() / zoomToRect.height();
+        if (FloatUtils.fuzzyEquals(targetRatio, rectRatio)) {
+            // all good, do nothing
+        } else if (targetRatio < rectRatio) {
+            // need to increase zoomToRect height
+            float newHeight = zoomToRect.width() / targetRatio;
+            zoomToRect.top -= (newHeight - zoomToRect.height()) / 2;
+            zoomToRect.bottom = zoomToRect.top + newHeight;
+        } else { // targetRatio > rectRatio) {
+            // need to increase zoomToRect width
+            float newWidth = targetRatio * zoomToRect.height();
+            zoomToRect.left -= (newWidth - zoomToRect.width()) / 2;
+            zoomToRect.right = zoomToRect.left + newWidth;
+        }
+
+        float finalZoom = viewport.width() * startZoom / zoomToRect.width();
+
+        ViewportMetrics finalMetrics = new ViewportMetrics(mController.getViewportMetrics());
+        finalMetrics.setOrigin(new PointF(zoomToRect.left, zoomToRect.top));
+        finalMetrics.scaleTo(finalZoom, new PointF(0.0f, 0.0f));
+
+        // 2. now run getValidViewportMetrics on it, so that the target viewport is
+        // clamped down to prevent overscroll, over-zoom, and other bad conditions.
+        finalMetrics = getValidViewportMetrics(finalMetrics);
+
+        bounce(finalMetrics);
+        return true;
+    }
+}
diff --git a/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/ui/SimpleScaleGestureDetector.java b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/ui/SimpleScaleGestureDetector.java
new file mode 100644
index 000000000000..4f9e39857e81
--- /dev/null
+++ b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/ui/SimpleScaleGestureDetector.java
@@ -0,0 +1,332 @@
+/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
+ * ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Mozilla Android code.
+ *
+ * The Initial Developer of the Original Code is Mozilla Foundation.
+ * Portions created by the Initial Developer are Copyright (C) 2012
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Patrick Walton <pcwalton@mozilla.com>
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+package org.mozilla.gecko.ui;
+
+import org.mozilla.gecko.gfx.PointUtils;
+import org.json.JSONException;
+import android.graphics.PointF;
+import android.util.Log;
+import android.view.MotionEvent;
+import java.util.LinkedList;
+import java.util.ListIterator;
+import java.util.Stack;
+
+/**
+ * A less buggy, and smoother, replacement for the built-in Android ScaleGestureDetector.
+ *
+ * This gesture detector is more reliable than the built-in ScaleGestureDetector because:
+ *
+ *   - It doesn't assume that pointer IDs are numbered 0 and 1.
+ *
+ *   - It doesn't attempt to correct for "slop" when resting one's hand on the device. On some
+ *     devices (e.g. the Droid X) this can cause the ScaleGestureDetector to lose track of how many
+ *     pointers are down, with disastrous results (bug 706684).
+ *
+ *   - Cancelling a zoom into a pan is handled correctly.
+ *
+ *   - Starting with three or more fingers down, releasing fingers so that only two are down, and
+ *     then performing a scale gesture is handled correctly.
+ *
+ *   - It doesn't take pressure into account, which results in smoother scaling.
+ */
+public class SimpleScaleGestureDetector {
+    private static final String LOGTAG = "GeckoSimpleScaleGestureDetector";
+
+    private SimpleScaleGestureListener mListener;
+    private long mLastEventTime;
+
+    /* Information about all pointers that are down. */
+    private LinkedList<PointerInfo> mPointerInfo;
+
+    /** Creates a new gesture detector with the given listener. */
+    public SimpleScaleGestureDetector(SimpleScaleGestureListener listener) {
+        mListener = listener;
+        mPointerInfo = new LinkedList<PointerInfo>();
+    }
+
+    /** Forward touch events to this function. */
+    public void onTouchEvent(MotionEvent event) {
+        switch (event.getAction() & MotionEvent.ACTION_MASK) {
+            case MotionEvent.ACTION_DOWN:
+            case MotionEvent.ACTION_POINTER_DOWN:
+                onTouchStart(event);
+                break;
+            case MotionEvent.ACTION_MOVE:
+                onTouchMove(event);
+                break;
+            case MotionEvent.ACTION_POINTER_UP:
+            case MotionEvent.ACTION_UP:
+            case MotionEvent.ACTION_CANCEL:
+                onTouchEnd(event);
+                break;
+        }
+    }
+
+    private int getPointersDown() {
+        return mPointerInfo.size();
+    }
+
+    private int getActionIndex(MotionEvent event) {
+        return (event.getAction() & MotionEvent.ACTION_POINTER_INDEX_MASK)
+                >> MotionEvent.ACTION_POINTER_INDEX_SHIFT;
+    }
+
+    private void onTouchStart(MotionEvent event) {
+        mLastEventTime = event.getEventTime();
+        mPointerInfo.addFirst(PointerInfo.create(event, getActionIndex(event)));
+        if (getPointersDown() == 2) {
+            sendScaleGesture(EventType.BEGIN);
+        }
+    }
+
+    private void onTouchMove(MotionEvent event) {
+        mLastEventTime = event.getEventTime();
+        for (int i = 0; i < event.getPointerCount(); i++) {
+            PointerInfo pointerInfo = pointerInfoForEventIndex(event, i);
+            if (pointerInfo != null) {
+                pointerInfo.populate(event, i);
+            }
+        }
+
+        if (getPointersDown() == 2) {
+            sendScaleGesture(EventType.CONTINUE);
+        }
+    }
+
+    private void onTouchEnd(MotionEvent event) {
+        mLastEventTime = event.getEventTime();
+
+        int id = event.getPointerId(getActionIndex(event));
+        ListIterator<PointerInfo> iterator = mPointerInfo.listIterator();
+        while (iterator.hasNext()) {
+            PointerInfo pointerInfo = iterator.next();
+            if (pointerInfo.getId() != id) {
+                continue;
+            }
+
+            // One of the pointers we were tracking was lifted. Remove its info object from the
+            // list, recycle it to avoid GC pauses, and send an onScaleEnd() notification if this
+            // ended the gesture.
+            iterator.remove();
+            pointerInfo.recycle();
+            if (getPointersDown() == 1) {
+                sendScaleGesture(EventType.END);
+            }
+        }
+    }
+
+    /**
+     * Returns the X coordinate of the focus location (the midpoint of the two fingers). If only
+     * one finger is down, returns the location of that finger.
+     */
+    public float getFocusX() {
+        switch (getPointersDown()) {
+            case 1:
+                return mPointerInfo.getFirst().getCurrent().x;
+            case 2:
+                PointerInfo pointerA = mPointerInfo.getFirst(), pointerB = mPointerInfo.getLast();
+                return (pointerA.getCurrent().x + pointerB.getCurrent().x) / 2.0f;
+        }
+
+        Log.e(LOGTAG, "No gesture taking place in getFocusX()!");
+        return 0.0f;
+    }
+
+    /**
+     * Returns the Y coordinate of the focus location (the midpoint of the two fingers). If only
+     * one finger is down, returns the location of that finger.
+     */
+    public float getFocusY() {
+        switch (getPointersDown()) {
+            case 1:
+                return mPointerInfo.getFirst().getCurrent().y;
+            case 2:
+                PointerInfo pointerA = mPointerInfo.getFirst(), pointerB = mPointerInfo.getLast();
+                return (pointerA.getCurrent().y + pointerB.getCurrent().y) / 2.0f;
+        }
+
+        Log.e(LOGTAG, "No gesture taking place in getFocusY()!");
+        return 0.0f;
+    }
+
+    /** Returns the most recent distance between the two pointers. */
+    public float getCurrentSpan() {
+        if (getPointersDown() != 2) {
+            Log.e(LOGTAG, "No gesture taking place in getCurrentSpan()!");
+            return 0.0f;
+        }
+
+        PointerInfo pointerA = mPointerInfo.getFirst(), pointerB = mPointerInfo.getLast();
+        return PointUtils.distance(pointerA.getCurrent(), pointerB.getCurrent());
+    }
+
+    /** Returns the second most recent distance between the two pointers. */
+    public float getPreviousSpan() {
+        if (getPointersDown() != 2) {
+            Log.e(LOGTAG, "No gesture taking place in getPreviousSpan()!");
+            return 0.0f;
+        }
+
+        PointerInfo pointerA = mPointerInfo.getFirst(), pointerB = mPointerInfo.getLast();
+        PointF a = pointerA.getPrevious(), b = pointerB.getPrevious();
+        if (a == null || b == null) {
+            a = pointerA.getCurrent();
+            b = pointerB.getCurrent();
+        }
+
+        return PointUtils.distance(a, b);
+    }
+
+    /** Returns the time of the last event related to the gesture. */
+    public long getEventTime() {
+        return mLastEventTime;
+    }
+
+    /** Returns true if the scale gesture is in progress and false otherwise. */
+    public boolean isInProgress() {
+        return getPointersDown() == 2;
+    }
+
+    /* Sends the requested scale gesture notification to the listener. */
+    private void sendScaleGesture(EventType eventType) {
+        switch (eventType) {
+            case BEGIN:     mListener.onScaleBegin(this);   break;
+            case CONTINUE:  mListener.onScale(this);        break;
+            case END:       mListener.onScaleEnd(this);     break;
+        }
+    }
+
+    /*
+     * Returns the pointer info corresponding to the given pointer index, or null if the pointer
+     * isn't one that's being tracked.
+     */
+    private PointerInfo pointerInfoForEventIndex(MotionEvent event, int index) {
+        int id = event.getPointerId(index);
+        for (PointerInfo pointerInfo : mPointerInfo) {
+            if (pointerInfo.getId() == id) {
+                return pointerInfo;
+            }
+        }
+        return null;
+    }
+
+    private enum EventType {
+        BEGIN,
+        CONTINUE,
+        END,
+    }
+
+    /* Encapsulates information about one of the two fingers involved in the gesture. */
+    private static class PointerInfo {
+        /* A free list that recycles pointer info objects, to reduce GC pauses. */
+        private static Stack<PointerInfo> sPointerInfoFreeList;
+
+        private int mId;
+        private PointF mCurrent, mPrevious;
+
+        private PointerInfo() {
+            // External users should use create() instead.
+        }
+
+        /* Creates or recycles a new PointerInfo instance from an event and a pointer index. */
+        public static PointerInfo create(MotionEvent event, int index) {
+            if (sPointerInfoFreeList == null) {
+                sPointerInfoFreeList = new Stack<PointerInfo>();
+            }
+
+            PointerInfo pointerInfo;
+            if (sPointerInfoFreeList.empty()) {
+                pointerInfo = new PointerInfo();
+            } else {
+                pointerInfo = sPointerInfoFreeList.pop();
+            }
+
+            pointerInfo.populate(event, index);
+            return pointerInfo;
+        }
+
+        /*
+         * Fills in the fields of this instance from the given motion event and pointer index
+         * within that event.
+         */
+        public void populate(MotionEvent event, int index) {
+            mId = event.getPointerId(index);
+            mPrevious = mCurrent;
+            mCurrent = new PointF(event.getX(index), event.getY(index));
+        }
+
+        public void recycle() {
+            mId = -1;
+            mPrevious = mCurrent = null;
+            sPointerInfoFreeList.push(this);
+        }
+
+        public int getId() { return mId; }
+        public PointF getCurrent() { return mCurrent; }
+        public PointF getPrevious() { return mPrevious; }
+
+        @Override
+        public String toString() {
+            if (mId == -1) {
+                return "(up)";
+            }
+
+            try {
+                String prevString;
+                if (mPrevious == null) {
+                    prevString = "n/a";
+                } else {
+                    prevString = PointUtils.toJSON(mPrevious).toString();
+                }
+
+                // The current position should always be non-null.
+                String currentString = PointUtils.toJSON(mCurrent).toString();
+                return "id=" + mId + " cur=" + currentString + " prev=" + prevString;
+            } catch (JSONException e) {
+                throw new RuntimeException(e);
+            }
+        }
+    }
+
+    public static interface SimpleScaleGestureListener {
+        public boolean onScale(SimpleScaleGestureDetector detector);
+        public boolean onScaleBegin(SimpleScaleGestureDetector detector);
+        public void onScaleEnd(SimpleScaleGestureDetector detector);
+    }
+}
+
diff --git a/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/ui/SubdocumentScrollHelper.java b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/ui/SubdocumentScrollHelper.java
new file mode 100644
index 000000000000..f24a5b7adaa1
--- /dev/null
+++ b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/ui/SubdocumentScrollHelper.java
@@ -0,0 +1,140 @@
+/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
+ * ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Mozilla Android code.
+ *
+ * The Initial Developer of the Original Code is Mozilla Foundation.
+ * Portions created by the Initial Developer are Copyright (C) 2012
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Kartikaya Gupta <kgupta@mozilla.com>
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+package org.mozilla.gecko.ui;
+
+
+import android.graphics.PointF;
+import android.os.Handler;
+import android.util.Log;
+
+import org.json.JSONException;
+import org.json.JSONObject;
+import org.mozilla.gecko.GeckoEventListener;
+
+class SubdocumentScrollHelper implements GeckoEventListener {
+    private static final String LOGTAG = "GeckoSubdocumentScrollHelper";
+
+    private static String MESSAGE_PANNING_OVERRIDE = "Panning:Override";
+    private static String MESSAGE_CANCEL_OVERRIDE = "Panning:CancelOverride";
+    private static String MESSAGE_SCROLL = "Gesture:Scroll";
+    private static String MESSAGE_SCROLL_ACK = "Gesture:ScrollAck";
+
+    private final PanZoomController mPanZoomController;
+    private final Handler mUiHandler;
+
+    private boolean mOverridePanning;
+    private boolean mOverrideScrollAck;
+    private boolean mOverrideScrollPending;
+    private boolean mScrollSucceeded;
+
+    SubdocumentScrollHelper(PanZoomController controller) {
+        mPanZoomController = controller;
+        // mUiHandler will be bound to the UI thread since that's where this constructor runs
+        mUiHandler = new Handler();
+
+        //GeckoAppShell.registerGeckoEventListener(MESSAGE_PANNING_OVERRIDE, this);
+        //GeckoAppShell.registerGeckoEventListener(MESSAGE_CANCEL_OVERRIDE, this);
+        //GeckoAppShell.registerGeckoEventListener(MESSAGE_SCROLL_ACK, this);
+    }
+
+    boolean scrollBy(PointF displacement) {
+        if (!mOverridePanning) {
+            return false;
+        }
+
+        if (!mOverrideScrollAck) {
+            mOverrideScrollPending = true;
+            return true;
+        }
+
+        mOverrideScrollAck = false;
+        mOverrideScrollPending = false;
+
+        JSONObject json = new JSONObject();
+        try {
+            json.put("x", displacement.x);
+            json.put("y", displacement.y);
+        } catch (JSONException e) {
+            Log.e(LOGTAG, "Error forming subwindow scroll message: ", e);
+        }
+        //GeckoAppShell.sendEventToGecko(GeckoEvent.createBroadcastEvent(MESSAGE_SCROLL, json.toString()));
+
+        return true;
+    }
+
+    void cancel() {
+        mOverridePanning = false;
+    }
+
+    boolean scrolling() {
+        return mOverridePanning;
+    }
+
+    boolean lastScrollSucceeded() {
+        return mScrollSucceeded;
+    }
+
+    // GeckoEventListener implementation
+
+    public void handleMessage(final String event, final JSONObject message) {
+        // this comes in on the gecko thread; hand off the handling to the UI thread
+        mUiHandler.post(new Runnable() {
+            public void run() {
+                Log.i(LOGTAG, "Got message: " + event);
+                try {
+                    if (MESSAGE_PANNING_OVERRIDE.equals(event)) {
+                        mOverridePanning = true;
+                        mOverrideScrollAck = true;
+                        mOverrideScrollPending = false;
+                        mScrollSucceeded = true;
+                    } else if (MESSAGE_CANCEL_OVERRIDE.equals(event)) {
+                        mOverridePanning = false;
+                    } else if (MESSAGE_SCROLL_ACK.equals(event)) {
+                        mOverrideScrollAck = true;
+                        mScrollSucceeded = message.getBoolean("scrolled");
+                        if (mOverridePanning && mOverrideScrollPending) {
+                            scrollBy(mPanZoomController.getDisplacement());
+                        }
+                    }
+                } catch (Exception e) {
+                    Log.e(LOGTAG, "Exception handling message", e);
+                }
+            }
+        });
+    }
+}
diff --git a/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/util/FloatUtils.java b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/util/FloatUtils.java
new file mode 100644
index 000000000000..b4bb249c4d5f
--- /dev/null
+++ b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/util/FloatUtils.java
@@ -0,0 +1,43 @@
+/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+package org.mozilla.gecko.util;
+
+import android.graphics.PointF;
+
+import java.lang.IllegalArgumentException;
+
+public final class FloatUtils {
+    private FloatUtils() {}
+
+    public static boolean fuzzyEquals(float a, float b) {
+        return (Math.abs(a - b) < 1e-6);
+    }
+
+    public static boolean fuzzyEquals(PointF a, PointF b) {
+        return fuzzyEquals(a.x, b.x) && fuzzyEquals(a.y, b.y);
+    }
+
+    /*
+     * Returns the value that represents a linear transition between `from` and `to` at time `t`,
+     * which is on the scale [0, 1). Thus with t = 0.0f, this returns `from`; with t = 1.0f, this
+     * returns `to`; with t = 0.5f, this returns the value halfway from `from` to `to`.
+     */
+    public static float interpolate(float from, float to, float t) {
+        return from + (to - from) * t;
+    }
+
+    /**
+     * Returns 'value', clamped so that it isn't any lower than 'low', and it
+     * isn't any higher than 'high'.
+     */
+    public static float clamp(float value, float low, float high) {
+        if (high < low) {
+            throw new IllegalArgumentException(
+                    "clamp called with invalid parameters (" + high + " < " + low + ")" );
+        }
+        return Math.max(low, Math.min(high, value));
+    }
+}