Making OutputSurface a begin frame source and vsync source.

cc/trees/single_thread_proxy.cc

Index: cc/trees/single_thread_proxy.cc
diff --git a/cc/trees/single_thread_proxy.cc b/cc/trees/single_thread_proxy.cc
index 646bc3fbe4500e3220ac371170d24b8a856a484e..0d7f22303cc3fbbe173840e2d0b9dfde87c25a72 100644
--- a/cc/trees/single_thread_proxy.cc
+++ b/cc/trees/single_thread_proxy.cc
@@ -115,6 +115,7 @@ void SingleThreadProxy::CreateAndInitializeOutputSurface() {
 
   scoped_ptr<OutputSurface> output_surface =
       layer_tree_host_->CreateOutputSurface();
+  OutputSurface* output_surface_ptr = output_surface.get();
 
   renderer_capabilities_for_main_thread_ = RendererCapabilities();
 
@@ -131,7 +132,8 @@ void SingleThreadProxy::CreateAndInitializeOutputSurface() {
 
   if (success) {
     if (scheduler_on_impl_thread_)
-      scheduler_on_impl_thread_->DidCreateAndInitializeOutputSurface();
+      scheduler_on_impl_thread_->DidCreateAndInitializeOutputSurface(
+          output_surface_ptr);
   } else if (Proxy::MainThreadTaskRunner()) {
     MainThreadTaskRunner()->PostTask(
         FROM_HERE,
@@ -551,10 +553,6 @@ bool SingleThreadProxy::MainFrameWillHappenForTesting() {
   return false;
 }
 
-BeginFrameSource* SingleThreadProxy::GetExternalBeginFrameSource() {
-  return layer_tree_host_impl_.get();
-}
-
 void SingleThreadProxy::WillBeginImplFrame(const BeginFrameArgs& args) {
   layer_tree_host_impl_->WillBeginImplFrame(args);
 }