Limit outstanding surface draw swaps to max_frames_pending.

content/browser/compositor/onscreen_display_client.h

Index: content/browser/compositor/onscreen_display_client.h
diff --git a/content/browser/compositor/onscreen_display_client.h b/content/browser/compositor/onscreen_display_client.h
index 7dc073cf9e951b58e5e64e021fbacaabaa6fe68d..12fac97b458d25c1c24d15d4d9cae87359b7682a 100644
--- a/content/browser/compositor/onscreen_display_client.h
+++ b/content/browser/compositor/onscreen_display_client.h
@@ -34,14 +34,21 @@ class OnscreenDisplayClient : cc::DisplayClient {
   // cc::DisplayClient implementation.
   virtual scoped_ptr<cc::OutputSurface> CreateOutputSurface() OVERRIDE;
   virtual void DisplayDamaged() OVERRIDE;
+  virtual void DidSwapBuffers() OVERRIDE;
+  virtual void DidSwapBuffersComplete() OVERRIDE;
 
  private:
+  void ScheduleDraw();
   void Draw();
 
   scoped_ptr<cc::OutputSurface> output_surface_;
   scoped_ptr<cc::Display> display_;
   scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
   bool scheduled_draw_;
+  // True if a draw should be scheduled, but it's hit the limit on max frames
+  // pending.
+  bool deferred_draw_;
+  int pending_frames_;
 
   base::WeakPtrFactory<OnscreenDisplayClient> weak_ptr_factory_;