Add a command line switch to control accelerated 2d canvas

webkit/glue/webpreferences.cc

Index: webkit/glue/webpreferences.cc
diff --git a/webkit/glue/webpreferences.cc b/webkit/glue/webpreferences.cc
index 987cef449c98d5521c43e3935d55e5fb89357ddd..b8229a52666a72390887ad396704ce27d7870ba1 100644
--- a/webkit/glue/webpreferences.cc
+++ b/webkit/glue/webpreferences.cc
@@ -96,6 +96,9 @@ void WebPreferences::Apply(WebView* web_view) const {
   // Enable gpu-accelerated compositing if requested on the command line.
   settings->setAcceleratedCompositingEnabled(accelerated_compositing_enabled);
 
+  // Enable gpu-accelerated 2d canvas if requested on the command line.
+  settings->setAccelerated2dCanvasEnabled(accelerated_2d_canvas_enabled);
+
   // Enable memory info reporting to page if requested on the command line.
   settings->setMemoryInfoEnabled(memory_info_enabled);