Add vsync notification command line switch

webkit/glue/webpreferences.cc

Index: webkit/glue/webpreferences.cc
diff --git a/webkit/glue/webpreferences.cc b/webkit/glue/webpreferences.cc
index 9b38ca5792e70b33f82c3f45c045114968b0bf82..3748b4b6582944042a65bd3f0ee3df7d3af40753 100644
--- a/webkit/glue/webpreferences.cc
+++ b/webkit/glue/webpreferences.cc
@@ -89,6 +89,7 @@ WebPreferences::WebPreferences()
       mock_scrollbars_enabled(false),
       show_paint_rects(false),
       render_vsync_enabled(true),
+      render_vsync_notification_enabled(false),
       asynchronous_spell_checking_enabled(true),
       unified_textchecker_enabled(false),
       accelerated_compositing_enabled(false),
@@ -389,6 +390,8 @@ void WebPreferences::Apply(WebView* web_view) const {
 
   // Set whether to throttle framerate to Vsync.
   settings->setRenderVSyncEnabled(render_vsync_enabled);
+  settings->setRenderVSyncNotificationEnabled(
+      render_vsync_notification_enabled);
 
   // Enable gpu-accelerated compositing if requested on the command line.
   settings->setAcceleratedCompositingEnabled(accelerated_compositing_enabled);