cc: Make separate interface for BeginFrame ipc from OutputSurface

cc/test/fake_output_surface_client.cc

Index: cc/test/fake_output_surface_client.cc
diff --git a/cc/test/fake_output_surface_client.cc b/cc/test/fake_output_surface_client.cc
index 77c7f8a208283623ced2367926d251d2af43d2a1..9665db4b0733d7417f48eab14e0b1d3323c120a3 100644
--- a/cc/test/fake_output_surface_client.cc
+++ b/cc/test/fake_output_surface_client.cc
@@ -16,14 +16,6 @@ void FakeOutputSurfaceClient::ReleaseGL() {
     output_surface_->ReleaseContextProvider();
 }
 
-void FakeOutputSurfaceClient::BeginFrame(const BeginFrameArgs& args) {
-  begin_frame_count_++;
-}
-
-void FakeOutputSurfaceClient::DidSwapBuffers() {
-  swap_count_++;
-}
-
 void FakeOutputSurfaceClient::DidLoseOutputSurface() {
   did_lose_output_surface_called_ = true;
 }