Making OutputSurface a begin frame source and vsync source.

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 9c027eae60e99a14983618d636bbb3dbe7e6981f..95afacac0aca21dde929f9f9edb241f1ba8d129e 100644
--- a/cc/test/fake_output_surface.cc
+++ b/cc/test/fake_output_surface.cc
@@ -82,11 +82,16 @@ void FakeOutputSurface::SwapBuffers(CompositorFrame* frame) {
   }
 }
 
-void FakeOutputSurface::SetNeedsBeginFrame(bool enable) {
-  needs_begin_frame_ = enable;
-  OutputSurface::SetNeedsBeginFrame(enable);
+void FakeOutputSurface::SetNeedsBeginFrames(bool enable) {
+  OutputSurface::SetNeedsBeginFrames(enable);
+  if (enable)
+    OnBeginFrame();
+}
+
+void FakeOutputSurface::OnBeginFrame() {
+  if (NeedsBeginFrames()) {
+    SendBeginFrame(CreateBeginFrameArgsForTesting());
 
-  if (enable) {
     base::MessageLoop::current()->PostDelayedTask(
         FROM_HERE,
         base::Bind(&FakeOutputSurface::OnBeginFrame,
@@ -95,11 +100,10 @@ void FakeOutputSurface::SetNeedsBeginFrame(bool enable) {
   }
 }
 
-void FakeOutputSurface::OnBeginFrame() {
-  client_->BeginFrame(CreateBeginFrameArgsForTesting());
+void FakeOutputSurface::AsValueInto(base::debug::TracedValue* dict) const {
+  dict->SetString("type", "FakeOutputSurface");
 }
 
-
 bool FakeOutputSurface::BindToClient(OutputSurfaceClient* client) {
   if (OutputSurface::BindToClient(client)) {
     client_ = client;