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

webkit/glue/webpreferences.cc

Index: webkit/glue/webpreferences.cc
===================================================================
--- webkit/glue/webpreferences.cc	(revision 120216)
+++ webkit/glue/webpreferences.cc	(working copy)
@@ -87,6 +87,7 @@
       accelerated_animation_enabled(false),
       accelerated_video_enabled(false),
       accelerated_2d_canvas_enabled(false),
+      deferred_2d_canvas_enabled(false),
       accelerated_painting_enabled(false),
       accelerated_filters_enabled(false),
       accelerated_plugins_enabled(false),
@@ -283,6 +284,9 @@
   // Enable gpu-accelerated 2d canvas if requested on the command line.
   settings->setAccelerated2dCanvasEnabled(accelerated_2d_canvas_enabled);
 
+  // Enable deferred 2d canvas if requested on the command line.
+  settings->setDeferred2dCanvasEnabled(deferred_2d_canvas_enabled);
+
   // Enable gpu-accelerated painting if requested on the command line.
   settings->setAcceleratedPaintingEnabled(accelerated_painting_enabled);