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..e44153c75911b4e770a2a472c6ac9b031668f4be 100644
--- a/cc/test/fake_output_surface.h
+++ b/cc/test/fake_output_surface.h
@@ -94,10 +94,8 @@ class FakeOutputSurface : public OutputSurface {
 
   virtual void SwapBuffers(CompositorFrame* frame) OVERRIDE;
 
-  virtual void SetNeedsBeginImplFrame(bool enable) OVERRIDE;
-  bool needs_begin_impl_frame() const {
-    return needs_begin_impl_frame_;
-  }
+  virtual void SetNeedsBeginFrame(bool enable) OVERRIDE;
+  bool needs_begin_frame() const { return needs_begin_frame_; }
 
   void set_forced_draw_to_software_device(bool forced) {
     forced_draw_to_software_device_ = forced;
@@ -140,12 +138,12 @@ class FakeOutputSurface : public OutputSurface {
       scoped_ptr<SoftwareOutputDevice> software_device,
       bool delegated_rendering);
 
-  void OnBeginImplFrame();
+  void OnBeginFrame();
 
   OutputSurfaceClient* client_;
   CompositorFrame last_sent_frame_;
   size_t num_sent_frames_;
-  bool needs_begin_impl_frame_;
+  bool needs_begin_frame_;
   bool forced_draw_to_software_device_;
   bool has_external_stencil_test_;
   TransferableResourceArray resources_held_by_parent_;