cc: Emulate BeginFrame in OutputSurfaces that don't support it natively

cc/test/fake_output_surface.cc

Index: cc/test/fake_output_surface.cc
diff --git a/cc/test/fake_output_surface.cc b/cc/test/fake_output_surface.cc
index 6c5bc9f849d0fc95ec0b7c4637aeb04c4c35a036..32a9553a9168869cb3fe817af23fb37648d1ab7f 100644
--- a/cc/test/fake_output_surface.cc
+++ b/cc/test/fake_output_surface.cc
@@ -38,15 +38,17 @@ void FakeOutputSurface::SendFrameToParentCompositor(
   ++num_sent_frames_;
   base::MessageLoop::current()->PostTask(
       FROM_HERE, base::Bind(&FakeOutputSurface::SendFrameAck,
-                            weak_ptr_factory_.GetWeakPtr()));
+                            weak_ptr_factsory_.GetWeakPtr()));
+  DidSwapBuffers();
 }
 
 void FakeOutputSurface::SetNeedsBeginFrame(bool enable) {
   needs_begin_frame_ = enable;
+  OutputSurface::SetNeedsBeginFrame(enable);
 }
 
 void FakeOutputSurface::BeginFrame(base::TimeTicks frame_time) {
-  client_->BeginFrame(frame_time);
+  BeginFrame(frame_time);
 }
 
 bool FakeOutputSurface::ForcedDrawToSoftwareDevice() const {
@@ -55,7 +57,7 @@ bool FakeOutputSurface::ForcedDrawToSoftwareDevice() const {
 
 void FakeOutputSurface::SendFrameAck() {
   CompositorFrameAck ack;
-  client_->OnSendFrameToParentCompositorAck(ack);
+  OnSendFrameToParentCompositorAck(ack);
 }
 
 }  // namespace cc