Provide a vsync notification to the renderer

cc/test/fake_output_surface.h

Index: cc/test/fake_output_surface.h
diff --git a/cc/test/fake_output_surface.h b/cc/test/fake_output_surface.h
index a2dd67cdbff7bfa08475dc794668cc8089cda5ac..cd96a2db2ae16ec24737a17888b615625955f5d6 100644
--- a/cc/test/fake_output_surface.h
+++ b/cc/test/fake_output_surface.h
@@ -13,6 +13,10 @@
 #include "cc/test/fake_web_graphics_context_3d.h"
 #include "third_party/WebKit/Source/Platform/chromium/public/WebGraphicsContext3D.h"
 
+namespace base {
+class TimeTicks;
+}
+
 namespace cc {
 
 class FakeOutputSurface : public OutputSurface {
@@ -69,6 +73,12 @@ class FakeOutputSurface : public OutputSurface {
   CompositorFrame& last_sent_frame() { return last_sent_frame_; }
   size_t num_sent_frames() { return num_sent_frames_; }
 
+  virtual void EnableVSyncNotification(bool enable) OVERRIDE;
+  bool vsync_notification_enabled() const {
+    return vsync_notification_enabled_;
+  }
+  void DidVSync(base::TimeTicks frame_time);
+
 private:
   explicit FakeOutputSurface(
       scoped_ptr<WebKit::WebGraphicsContext3D> context3d, bool has_parent);
@@ -81,6 +91,7 @@ private:
   OutputSurfaceClient* client_;
   CompositorFrame last_sent_frame_;
   size_t num_sent_frames_;
+  bool vsync_notification_enabled_;
 };
 
 static inline scoped_ptr<cc::OutputSurface> createFakeOutputSurface()