Plumb rendering statistics to benchmarking extension.

content/renderer/render_widget.h

Index: content/renderer/render_widget.h
diff --git a/content/renderer/render_widget.h b/content/renderer/render_widget.h
index 194d40c2153aa6bb397789a3184645814b226511..e72096cbd2950acdf6e8de044ecff10f0dbca3a5 100644
--- a/content/renderer/render_widget.h
+++ b/content/renderer/render_widget.h
@@ -40,6 +40,7 @@ class SyncMessage;
 
 namespace WebKit {
 class WebMouseEvent;
+class WebRenderingStats;
 class WebTouchEvent;
 class WebWidget;
 }
@@ -152,6 +153,8 @@ class CONTENT_EXPORT RenderWidget
   // pending moves don't try to reference it.
   void CleanupWindowInPluginMoves(gfx::PluginWindowHandle window);
 
+  void GetRenderingStats(WebKit::WebRenderingStats& stats) const;
+
   // Close the underlying WebWidget.
   virtual void Close();