Force accelerated 2d canvas off for chrome ui

chrome/browser/tab_contents/tab_contents.cc

 // Copyright (c) 2010 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/tab_contents.h"
 
 #if defined(OS_CHROMEOS)
 // For GdkScreen
 #include <gdk/gdk.h>
 #endif  // defined(OS_CHROMEOS)
@@ skipping 2857 matching lines @@
   }
   return url;
 }
 
 WebPreferences TabContents::GetWebkitPrefs() {
   Profile* profile = render_view_host()->process()->profile();
   bool is_dom_ui = false;
   WebPreferences web_prefs =
       RenderViewHostDelegateHelper::GetWebkitPrefs(profile, is_dom_ui);
 
-  // Force accelerated compositing off for chrome: and chrome-extension:
-  // pages.
+  // Force accelerated compositing and 2d canvas off for chrome: and
+  // chrome-extension: pages.
   if (GetURL().SchemeIs(chrome::kChromeUIScheme) ||
       GetURL().SchemeIs(chrome::kExtensionScheme)) {
     web_prefs.accelerated_compositing_enabled = false;
+    web_prefs.accelerated_2d_canvas_enabled = false;
   }
 
 #if defined(OS_MACOSX)
   // Disable accelerated compositing if IOSurface's are not supported,
   // as is the case in 10.5.
   if (!IOSurfaceSupport::Initialize())
       web_prefs.accelerated_compositing_enabled = false;
 #endif
 
   return web_prefs;
@@ skipping 402 matching lines @@
   AddInfoBar(new SavePasswordInfoBarDelegate(this, form_to_save));
 }
 
 Profile* TabContents::GetProfileForPasswordManager() {
   return profile();
 }
 
 bool TabContents::DidLastPageLoadEncounterSSLErrors() {
   return controller().ssl_manager()->ProcessedSSLErrorFromRequest();
 }