Plumbs ::didCompleteSwapBuffers in CompositorCC

ui/gfx/compositor/compositor.h

Index: ui/gfx/compositor/compositor.h
diff --git a/ui/gfx/compositor/compositor.h b/ui/gfx/compositor/compositor.h
index 2b41553d391e6bf43de20aceacfef77249e9f45b..e3d59b765b088781a0b6311eb2c4c93ea95d2412 100644
--- a/ui/gfx/compositor/compositor.h
+++ b/ui/gfx/compositor/compositor.h
@@ -182,6 +182,7 @@ class COMPOSITOR_EXPORT Compositor : public base::RefCounted<Compositor> {
   virtual void OnWidgetSizeChanged() = 0;
   virtual void OnRootLayerChanged();
   virtual void DrawTree();
+  virtual bool CompositesAsynchronously();
 
   CompositorDelegate* delegate() { return delegate_; }
 
@@ -190,14 +191,14 @@ class COMPOSITOR_EXPORT Compositor : public base::RefCounted<Compositor> {
   static void SwizzleRGBAToBGRAAndFlip(unsigned char* pixels,
                                        const gfx::Size& image_size);
 
+  // Notifies the compositor that compositing is complete.
+  void NotifyEnd();
+
  private:
   // Notifies the compositor that compositing is about to start. See Draw() for
   // notes about |force_clear|.
   void NotifyStart(bool force_clear);
 
-  // Notifies the compositor that compositing is complete.
-  void NotifyEnd();
-
   CompositorDelegate* delegate_;
   gfx::Size size_;