Adding command line switch --enable-deferred-2d-canvas

REVIEW=https://chromiumcodereview.appspot.com/9325004/
BUG=111204
TEST=None
Review URL: https://chromiumcodereview.appspot.com/9325004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@120829 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/content/browser/tab_contents/tab_contents.cc b/content/browser/tab_contents/tab_contents.cc
index 8b883d2..9863cee3 100644
--- a/content/browser/tab_contents/tab_contents.cc
+++ b/content/browser/tab_contents/tab_contents.cc
@@ -363,6 +363,8 @@
   prefs.accelerated_2d_canvas_enabled =
       GpuProcessHost::gpu_enabled() &&
       !command_line.HasSwitch(switches::kDisableAccelerated2dCanvas);
+  prefs.deferred_2d_canvas_enabled =
+      command_line.HasSwitch(switches::kEnableDeferred2dCanvas);
   prefs.accelerated_painting_enabled =
       GpuProcessHost::gpu_enabled() &&
       command_line.HasSwitch(switches::kEnableAcceleratedPainting);