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 eae7169b90f6c904cf7dc7edbbd7e33f7d644eb9..7eb872ec606739cc13991cacd6255a3a5670d662 100644
--- a/cc/test/fake_output_surface.cc
+++ b/cc/test/fake_output_surface.cc
@@ -46,7 +46,7 @@ void FakeOutputSurface::SetNeedsBeginFrame(bool enable) {
 }
 
 void FakeOutputSurface::BeginFrame(base::TimeTicks frame_time) {
-  client_->BeginFrame(frame_time);
+  BeginFrame(frame_time);
 }
 
 bool FakeOutputSurface::ForcedDrawToSoftwareDevice() const {
@@ -55,7 +55,7 @@ bool FakeOutputSurface::ForcedDrawToSoftwareDevice() const {
 
 void FakeOutputSurface::SendFrameAck() {
   CompositorFrameAck ack;
-  client_->OnSendFrameToParentCompositorAck(ack);
+  OnSendFrameToParentCompositorAck(ack);
 }
 
 }  // namespace cc