Added a command-line flag to enable h/w accelerated rendering of content layers.

webkit/glue/webpreferences.cc

 // Copyright (c) 2011 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.
 
 #include "webkit/glue/webpreferences.h"
 
 #include "base/string_util.h"
 #include "base/utf_string_conversions.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebRuntimeFeatures.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebKit.h"
@@ skipping 55 matching lines @@
       show_composited_layer_borders(false),
       show_composited_layer_tree(false),
       show_fps_counter(false),
       asynchronous_spell_checking_enabled(true),
       accelerated_compositing_enabled(false),
       force_compositing_mode(false),
       composite_to_texture_enabled(false),
       accelerated_layers_enabled(false),
       accelerated_video_enabled(false),
       accelerated_2d_canvas_enabled(false),
+      accelerated_drawing_enabled(false),
       accelerated_plugins_enabled(false),
       memory_info_enabled(false),
       interactive_form_validation_enabled(true),
       fullscreen_enabled(false) {
 }
 
 WebPreferences::~WebPreferences() {
 }
 
 void WebPreferences::Apply(WebView* web_view) const {
@@ skipping 90 matching lines @@
 
   // Always enter compositing if requested on the command line.
   settings->setForceCompositingMode(force_compositing_mode);
 
   // Enable composite to offscreen texture if requested on the command line.
   settings->setCompositeToTextureEnabled(composite_to_texture_enabled);
 
   // Enable gpu-accelerated 2d canvas if requested on the command line.
   settings->setAccelerated2dCanvasEnabled(accelerated_2d_canvas_enabled);
 
+  // Enable gpu-accelerated drawing if requested on the command line.
+  settings->setAcceleratedDrawingEnabled(accelerated_drawing_enabled);
+
   // Enabling accelerated layers from the command line enabled accelerated
   // 3D CSS, Video, and Animations.
   settings->setAcceleratedCompositingFor3DTransformsEnabled(
       accelerated_layers_enabled);
   settings->setAcceleratedCompositingForVideoEnabled(
       accelerated_video_enabled);
   settings->setAcceleratedCompositingForAnimationEnabled(
       accelerated_layers_enabled);
 
   // Enabling accelerated plugins if specified from the command line.
@@ skipping 17 matching lines @@
 
   // Tabs to link is not part of the settings. WebCore calls
   // ChromeClient::tabsToLinks which is part of the glue code.
   web_view->setTabsToLinks(tabs_to_links);
 
   settings->setInteractiveFormValidationEnabled(
       interactive_form_validation_enabled);
 
   settings->setFullScreenEnabled(fullscreen_enabled);
 }