Making OutputSurface a begin frame source and vsync source.

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 193d03c328887f2815c4af82a05a9c25817d9d2c..c743e18eb6001fac32f6fe0438d46b395debc733 100644
--- a/cc/test/fake_output_surface.h
+++ b/cc/test/fake_output_surface.h
@@ -94,9 +94,6 @@ class FakeOutputSurface : public OutputSurface {
 
   virtual void SwapBuffers(CompositorFrame* frame) OVERRIDE;
 
-  virtual void SetNeedsBeginFrame(bool enable) OVERRIDE;
-  bool needs_begin_frame() const { return needs_begin_frame_; }
-
   virtual bool BindToClient(OutputSurfaceClient* client) OVERRIDE;
 
   using OutputSurface::ReleaseGL;
@@ -119,6 +116,11 @@ class FakeOutputSurface : public OutputSurface {
   void SetMemoryPolicyToSetAtBind(
       scoped_ptr<ManagedMemoryPolicy> memory_policy_to_set_at_bind);
 
+  virtual void SetNeedsBeginFrames(bool needs_begin_frames) OVERRIDE;
+  virtual void AsValueInto(base::debug::TracedValue* dict) const OVERRIDE;
+
+  void TestSendBeginFrame(const BeginFrameArgs& args) { SendBeginFrame(args); }
+
  protected:
   FakeOutputSurface(
       scoped_refptr<ContextProvider> context_provider,