cc: Hook vsync time source to output surface

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 64c99aefdbf2bed51772a09e9dedb48ab6b63a02..a31c7e10042b60b2112442125a648afd4a163cc2 100644
--- a/cc/test/fake_output_surface.h
+++ b/cc/test/fake_output_surface.h
@@ -5,6 +5,7 @@
 #ifndef CC_TEST_FAKE_OUTPUT_SURFACE_H_
 #define CC_TEST_FAKE_OUTPUT_SURFACE_H_
 
+#include "base/time.h"
 #include "cc/output/compositor_frame.h"
 #include "cc/output/output_surface.h"
 #include "cc/output/software_output_device.h"
@@ -61,6 +62,12 @@ 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:
   FakeOutputSurface(
       scoped_ptr<WebKit::WebGraphicsContext3D> context3d,
@@ -72,6 +79,7 @@ class FakeOutputSurface : public OutputSurface {
 
   CompositorFrame last_sent_frame_;
   size_t num_sent_frames_;
+  bool vsync_notification_enabled_;
 };
 
 static inline scoped_ptr<cc::OutputSurface> CreateFakeOutputSurface() {