Merge 100404 - apps/extensions: Disable all kinds of acceleration for background pages.

chrome/browser/tab_contents/background_contents.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 "chrome/browser/tab_contents/background_contents.h"
 
 #include "chrome/browser/background/background_contents_service.h"
 #include "chrome/browser/extensions/extension_message_service.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/renderer_preferences_util.h"
@@ skipping 170 matching lines @@
   RendererPreferences preferences;
   renderer_preferences_util::UpdateFromSystemSettings(&preferences, profile);
   return preferences;
 }
 
 WebPreferences BackgroundContents::GetWebkitPrefs() {
   // TODO(rafaelw): Consider enabling the webkit_prefs.dom_paste_enabled for
   // apps.
   Profile* profile = Profile::FromBrowserContext(
       render_view_host_->process()->browser_context());
-  return RenderViewHostDelegateHelper::GetWebkitPrefs(profile,
-                                                      false);  // is_web_ui
+  WebPreferences prefs = RenderViewHostDelegateHelper::GetWebkitPrefs(profile,
+                                                                      false);
+  // Disable all kinds of acceleration for background pages.
+  // See http://crbug.com/96005 and http://crbug.com/96006
+  prefs.force_compositing_mode = false;
+  prefs.accelerated_compositing_enabled = false;
+  prefs.accelerated_2d_canvas_enabled = false;
+  prefs.accelerated_video_enabled = false;
+  prefs.accelerated_drawing_enabled = false;
+  prefs.accelerated_plugins_enabled = false;
+
+  return prefs;
 }
 
 void BackgroundContents::CreateNewWindow(
     int route_id,
     const ViewHostMsg_CreateWindow_Params& params) {
   Profile* profile = Profile::FromBrowserContext(
       render_view_host_->process()->browser_context());
   delegate_view_helper_.CreateNewWindow(
       route_id,
       profile,
@@ skipping 35 matching lines @@
 BackgroundContents*
 BackgroundContents::GetBackgroundContentsByID(int render_process_id,
                                               int render_view_id) {
   RenderViewHost* render_view_host =
       RenderViewHost::FromID(render_process_id, render_view_id);
   if (!render_view_host)
     return NULL;
 
   return render_view_host->delegate()->GetAsBackgroundContents();
 }