Force accelerated 2d canvas off for chrome ui

chrome/browser/tab_contents/tab_contents.cc

Index: chrome/browser/tab_contents/tab_contents.cc
diff --git a/chrome/browser/tab_contents/tab_contents.cc b/chrome/browser/tab_contents/tab_contents.cc
index 1d702bd78ae465c94d40eed541af3c0ef99f9b3b..2c6b9389a1646102035e39981980bd0eefd8b184 100644
--- a/chrome/browser/tab_contents/tab_contents.cc
+++ b/chrome/browser/tab_contents/tab_contents.cc
@@ -2875,11 +2875,12 @@ WebPreferences TabContents::GetWebkitPrefs() {
   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)