Disable hardware acceleration for ChromeActivities on low-end devices.

chrome/android/java/AndroidManifest.xml

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Copyright 2015 The Chromium Authors. All rights reserved.
      Use of this source code is governed by a BSD-style license that can be
      found in the LICENSE file. -->
 
 <!--
 Note: This is a jinja2 template, processed at build time into the final manifest.
 
 Blocks denoted with { % block some_name % }foo{ % endblock % } can be overridden
 by a child template that "extends" this file.
@@ skipping 100 matching lines @@
             android:value="true"/>
 
         {% if channel in ['dev', 'canary', 'default'] %}
         <meta-data android:name="com.sec.android.support.multiwindow" android:value="true" />
         {% endif %}
         {% if configuration_policy == '1' %}
         <meta-data android:name="android.content.APP_RESTRICTIONS"
             android:resource="@xml/app_restrictions"/>
         {% endif %}
 
-        <!-- Note: Set android:hardwareAccelerated to "false" in the ".Main"
-             activity below to go into software, browser tiling mode.
+        <!-- Note: All activities directly or indirectly derived from ChromeActivity
+             must specify android:hardwareAccelerated="false".
 
              Since this activity (shown in the launcher) and the application
              (shown in Android's Settings/Apps list) share the same label, we
              do not specify one here to allow it to inherit from the app. -->
         <activity android:name="org.chromium.chrome.browser.document.ChromeLauncherActivity"
             android:theme="@android:style/Theme.Translucent.NoTitleBar">
         </activity>
         <activity-alias android:name="com.google.android.apps.chrome.Main"
             android:targetActivity="org.chromium.chrome.browser.document.ChromeLauncherActivity"
             android:exported="true">
@@ skipping 66 matching lines @@
                 android:resource="@xml/searchable" />
         </activity-alias>
         <activity android:name="org.chromium.chrome.browser.document.DocumentActivity"
             android:exported="false"
             android:theme="@style/MainTheme"
             android:windowSoftInputMode="adjustResize"
             android:taskAffinity=""
             android:persistableMode="persistAcrossReboots"
             android:autoRemoveFromRecents="false"
             android:configChanges="orientation|keyboardHidden|keyboard|screenSize|mcc|mnc"
-            android:hardwareAccelerated="true">
+            android:hardwareAccelerated="false">
         </activity>
         <activity-alias android:name="com.google.android.apps.chrome.document.DocumentActivity"
             android:targetActivity="org.chromium.chrome.browser.document.DocumentActivity"
             android:exported="false"/>
         <activity android:name="org.chromium.chrome.browser.document.IncognitoDocumentActivity"
             android:icon="@mipmap/incognito_app_icon"
             android:exported="false"
             android:theme="@style/IncognitoTheme"
             android:windowSoftInputMode="adjustResize"
             android:taskAffinity=""
             android:persistableMode="persistNever"
             android:autoRemoveFromRecents="false"
             android:configChanges="orientation|keyboardHidden|keyboard|screenSize|mcc|mnc"
-            android:hardwareAccelerated="true">
+            android:hardwareAccelerated="false">
         </activity>
         <activity-alias android:name="com.google.android.apps.chrome.document.IncognitoDocumentActivity"
             android:targetActivity="org.chromium.chrome.browser.document.IncognitoDocumentActivity"
             android:exported="false"/>
         <activity android:name="org.chromium.chrome.browser.customtabs.CustomTabActivity"
             android:theme="@style/MainTheme"
             android:exported="false"
             android:windowSoftInputMode="adjustResize"
             android:configChanges="orientation|keyboardHidden|keyboard|screenSize|mcc|mnc"
-            android:hardwareAccelerated="true">
+            android:hardwareAccelerated="false">
         </activity>
         <activity android:name="org.chromium.chrome.browser.ChromeTabbedActivity"
              android:theme="@style/MainTheme"
              android:exported="false"
              android:windowBackground="@drawable/window_background"
              android:windowSoftInputMode="adjustResize"
              android:launchMode="singleTask"
              android:configChanges="orientation|keyboardHidden|keyboard|screenSize|mcc|mnc"
-             android:hardwareAccelerated="true">
+             android:hardwareAccelerated="false">
         </activity>
         <activity android:name="org.chromium.chrome.browser.multiwindow.MultiInstanceChromeTabbedActivity"
             android:theme="@style/MainTheme"
             android:exported="false"
             android:windowBackground="@drawable/window_background"
             android:windowSoftInputMode="adjustResize"
             android:configChanges="orientation|keyboardHidden|keyboard|screenSize|mcc|mnc"
-            android:hardwareAccelerated="true">
+            android:hardwareAccelerated="false">
         </activity>
         <activity android:name="org.chromium.chrome.browser.sync.ui.PassphraseActivity"
             android:theme="@style/MainTheme"
             android:autoRemoveFromRecents="true">
         </activity>
         <activity android:name="org.chromium.chrome.browser.bookmark.ManageBookmarkActivity"
             android:theme="@style/DialogWhenLargeHolo"
             android:label="@string/save_bookmark"
             android:windowSoftInputMode="stateHidden|adjustPan"
             android:configChanges="orientation|keyboardHidden|keyboard|screenSize|mcc|mnc">
@@ skipping 18 matching lines @@
             android:configChanges="orientation|keyboardHidden|keyboard|screenSize|mcc|mnc">
         </activity>
         <activity android:name="org.chromium.chrome.browser.preferences.Preferences"
             android:theme="@style/PreferencesTheme"
             android:configChanges="orientation|keyboardHidden|keyboard|screenSize|mcc|mnc"
             android:label="@string/preferences"
             android:exported="false">
         </activity>
         <activity android:name="org.chromium.chrome.browser.EmbedContentViewActivity"
             android:theme="@style/ThemeWithActionBar"
-            android:hardwareAccelerated="true"
+            android:hardwareAccelerated="false"
             android:configChanges="orientation|keyboardHidden|keyboard|screenSize|mcc|mnc">
         </activity>
         <activity android:name="org.chromium.chrome.browser.prerender.PrerenderAPITestActivity"
             android:theme="@style/MainTheme"
             android:exported="true">
         </activity>
         <activity android:name="org.chromium.chrome.browser.enhancedbookmarks.EnhancedBookmarkActivity"
             android:theme="@style/EnhancedBookmarkDialog"
             android:windowSoftInputMode="stateAlwaysHidden"
             android:configChanges="orientation|keyboardHidden|keyboard|screenSize|mcc|mnc" >
@@ skipping 31 matching lines @@
                 <action android:name="com.google.android.apps.chrome.webapps.WebappManager.ACTION_START_WEBAPP" />
                 <category android:name="android.intent.category.DEFAULT" />
             </intent-filter>
         </activity-alias>
         <activity android:name="org.chromium.chrome.browser.webapps.WebappActivity"
             android:theme="@style/MainTheme"
             android:label="@string/webapp_activity_title"
             android:documentLaunchMode="intoExisting"
             android:windowSoftInputMode="adjustResize"
             android:persistableMode="persistNever"
-            android:hardwareAccelerated="true"
+            android:hardwareAccelerated="false"
             android:configChanges="orientation|keyboardHidden|keyboard|screenSize|mcc|mnc">
         </activity>
         <activity-alias android:name="com.google.android.apps.chrome.webapps.WebappActivity"
             android:targetActivity="org.chromium.chrome.browser.webapps.WebappActivity"
             android:label="@string/webapp_activity_title">
         </activity-alias>
         {% for i in range(10) %}
         <activity android:name="org.chromium.chrome.browser.webapps.WebappActivity{{ i }}"
             android:theme="@style/MainTheme"
             android:icon="@mipmap/app_shortcut_icon"
             android:label="@string/webapp_activity_title"
             android:launchMode="singleTask"
             android:windowSoftInputMode="adjustResize"
             android:persistableMode="persistNever"
-            android:hardwareAccelerated="true"
+            android:hardwareAccelerated="false"
             android:taskAffinity="{{ manifest_package }}.webapps.WebappActivity{{ i }}"
             android:configChanges="orientation|keyboardHidden|keyboard|screenSize|mcc|mnc">
         </activity>
         <activity-alias android:name="com.google.android.apps.chrome.webapps.WebappActivity{{ i }}"
             android:targetActivity="org.chromium.chrome.browser.webapps.WebappActivity{{ i }}"
             android:icon="@mipmap/app_shortcut_icon"
             android:label="@string/webapp_activity_title">
         </activity-alias>
         {% endfor %}
 
         <activity android:name="org.chromium.chrome.browser.media.remote.ExpandedControllerActivity"
             android:theme="@style/MainTheme"
             android:label="Chrome.ExpandedControllerActivity"
             android:hardwareAccelerated="true"
             android:launchMode="singleTask"
             android:noHistory="true"
             android:configChanges="orientation|keyboardHidden|keyboard|screenSize|mcc|mnc"
             android:excludeFromRecents="true">
         </activity>
 
         <activity android:name="org.chromium.chrome.browser.childaccounts.ResetDataActivity"
             android:theme="@android:style/Theme.Translucent.NoTitleBar"
             android:exported="true"
             android:excludeFromRecents="true">
         </activity>
 
+        <!-- This activity is started along with IncognitoDocumentActivity, so it also must
+             disable hardware acceleration. Besides, it doesn't have any UI. -->
         <activity android:name="org.chromium.chrome.browser.document.CipherKeyActivity"
             android:launchMode="singleInstance"
             android:theme="@android:style/Theme.Translucent.NoTitleBar"
-            android:excludeFromRecents="true">
+            android:excludeFromRecents="true"
+            android:hardwareAccelerated="false">
         </activity>
 
         <!-- Providers for chrome data. -->
         <provider android:name="org.chromium.chrome.browser.ChromeBrowserProvider"
             android:authorities="{{ manifest_package }}.ChromeBrowserProvider;{{ manifest_package }}.browser;{{ manifest_package }}"
             android:exported="true">
             <path-permission android:path="/bookmarks/search_suggest_query"
                     android:readPermission="android.permission.GLOBAL_SEARCH" />
         </provider>
 
@@ skipping 233 matching lines @@
              choose the first MediaRouteController that can play it, so the order of the list can be important.
              The most specific MediaRouteControllers should be listed first, followed by more generic ones.
              The downstream manifest replaces this block, and hence replaces the list of media route
              controllers with its own list. -->
         <meta-data android:name="org.chromium.content.browser.REMOTE_MEDIA_PLAYERS"
             android:value="org.chromium.chrome.browser.media.remote.DefaultMediaRouteController"/>
 
         {% endblock %}
     </application>
 </manifest>