Implement isRenderingVSynced on RenderWidget

webkit/glue/webpreferences.cc

Index: webkit/glue/webpreferences.cc
diff --git a/webkit/glue/webpreferences.cc b/webkit/glue/webpreferences.cc
index 77fa22377d8f4b48acbc48da7d093f9cc110b04f..34e9b4d1a9d56b0910acad8139de5f0504ee06de 100644
--- a/webkit/glue/webpreferences.cc
+++ b/webkit/glue/webpreferences.cc
@@ -79,6 +79,7 @@ WebPreferences::WebPreferences()
       show_composited_layer_tree(false),
       show_fps_counter(false),
       show_paint_rects(false),
+      render_vsync_enabled(true),
       asynchronous_spell_checking_enabled(true),
       unified_textchecker_enabled(false),
       accelerated_compositing_enabled(false),
@@ -320,6 +321,9 @@ void WebPreferences::Apply(WebView* web_view) const {
   // overlay of rects, if requested on the command line.
   settings->setShowPaintRects(show_paint_rects);
 
+  // Set whether to throttle framerate to Vsync.
+  settings->setRenderVSyncEnabled(render_vsync_enabled);
+
   // Enable gpu-accelerated compositing if requested on the command line.
   settings->setAcceleratedCompositingEnabled(accelerated_compositing_enabled);