Disable hardware acceleration for ChromeActivities on low-end devices.

chrome/android/java/src/org/chromium/chrome/browser/ChromeActivity.java

 // 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.
 
 package org.chromium.chrome.browser;
 
 import android.annotation.SuppressLint;
 import android.app.Activity;
 import android.app.SearchManager;
 import android.app.assist.AssistContent;
@@ skipping 16 matching lines @@
 import android.support.v7.app.AlertDialog;
 import android.util.DisplayMetrics;
 import android.view.Menu;
 import android.view.MenuItem;
 import android.view.View;
 import android.view.ViewGroup;
 import android.view.ViewStub;
 import android.view.ViewTreeObserver;
 import android.view.ViewTreeObserver.OnPreDrawListener;
 import android.view.Window;
+import android.view.WindowManager;
 import android.view.accessibility.AccessibilityManager;
 import android.view.accessibility.AccessibilityManager.AccessibilityStateChangeListener;
 import android.view.accessibility.AccessibilityManager.TouchExplorationStateChangeListener;
 
 import org.chromium.base.ApiCompatibilityUtils;
 import org.chromium.base.BaseSwitches;
 import org.chromium.base.CommandLine;
 import org.chromium.base.Log;
+import org.chromium.base.SysUtils;
 import org.chromium.base.ThreadUtils;
 import org.chromium.base.TraceEvent;
 import org.chromium.base.VisibleForTesting;
 import org.chromium.base.metrics.RecordHistogram;
 import org.chromium.base.metrics.RecordUserAction;
 import org.chromium.chrome.R;
 import org.chromium.chrome.browser.BookmarksBridge.BookmarkModelObserver;
 import org.chromium.chrome.browser.IntentHandler.IntentHandlerDelegate;
 import org.chromium.chrome.browser.IntentHandler.TabOpenType;
 import org.chromium.chrome.browser.appmenu.AppMenu;
@@ skipping 277 matching lines @@
         TraceEvent.end("onCreate->setContentView()");
         mInflateInitialLayoutDurationMs = SystemClock.elapsedRealtime() - begin;
 
         // Set the status bar color to black by default. This is an optimization for
         // Chrome not to draw under status and navigation bars when we use the default
         // black status bar
         ApiCompatibilityUtils.setStatusBarColor(getWindow(), Color.BLACK);
 
         mCompositorViewHolder = (CompositorViewHolder) findViewById(R.id.compositor_view_holder);
         mCompositorViewHolder.setRootView(getWindow().getDecorView().getRootView());
+
+        enableHardwareAcceleration();
     }
 
     /**
      * Constructs {@link ToolbarManager} and the handler necessary for controlling the menu on the
      * {@link Toolbar}. Extending classes can override this call to avoid creating the toolbar.
      */
     protected void initializeToolbar() {
         final View controlContainer = findViewById(R.id.control_container);
         assert controlContainer != null;
         ToolbarControlContainer toolbarContainer = (ToolbarControlContainer) controlContainer;
@@ skipping 1091 matching lines @@
     }
 
     @Override
     public void terminateIncognitoSession() {}
 
     @Override
     public void onTabSelectionHinted(int tabId) { }
 
     @Override
     public void onSceneChange(Layout layout) { }
+
+    private void enableHardwareAcceleration() {
+        // HW acceleration is disabled in the manifest. Enable it only on high-end devices.
+        if (!SysUtils.isLowEndDevice()) {
+            getWindow().addFlags(WindowManager.LayoutParams.FLAG_HARDWARE_ACCELERATED);
+        }
+    }
 }