cc: Handle retroactive BeginFrames in the Scheduler.

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 965f54347af15803bc18aa24866b9c78ed86ba7d..f834c4f671f80730f950a262e9888f953af63765 100644
--- a/cc/test/fake_output_surface.h
+++ b/cc/test/fake_output_surface.h
@@ -94,7 +94,7 @@ class FakeOutputSurface : public OutputSurface {
 
   virtual void SwapBuffers(CompositorFrame* frame) OVERRIDE;
 
-  virtual void SetNeedsBeginImplFrame(bool enable) OVERRIDE;
+  virtual void SetNeedsBeginFrame(bool enable) OVERRIDE;
   bool needs_begin_impl_frame() const {
     return needs_begin_impl_frame_;
   }
@@ -140,7 +140,7 @@ class FakeOutputSurface : public OutputSurface {
       scoped_ptr<SoftwareOutputDevice> software_device,
       bool delegated_rendering);
 
-  void OnBeginImplFrame();
+  void OnBeginFrame();
 
   OutputSurfaceClient* client_;
   CompositorFrame last_sent_frame_;