Refactoring the way begin frame sources inside scheduler work.

cc/trees/thread_proxy.cc

Index: cc/trees/thread_proxy.cc
diff --git a/cc/trees/thread_proxy.cc b/cc/trees/thread_proxy.cc
index f14e38b92f41602c0f22f46bf9991a29725ee8ac..dc4e880882ece3faddffb93ed2003f95eee9f35e 100644
--- a/cc/trees/thread_proxy.cc
+++ b/cc/trees/thread_proxy.cc
@@ -341,16 +341,6 @@ void ThreadProxy::DidSwapBuffersCompleteOnImplThread() {
       base::Bind(&ThreadProxy::DidCompleteSwapBuffers, main_thread_weak_ptr_));
 }
 
-void ThreadProxy::SetNeedsBeginFrame(bool enable) {
-  TRACE_EVENT1("cc", "ThreadProxy::SetNeedsBeginFrame", "enable", enable);
-  impl().layer_tree_host_impl->SetNeedsBeginFrame(enable);
-  UpdateBackgroundAnimateTicking();
-}
-
-void ThreadProxy::BeginFrame(const BeginFrameArgs& args) {
-  impl().scheduler->BeginFrame(args);
-}
-
 void ThreadProxy::WillBeginImplFrame(const BeginFrameArgs& args) {
   impl().layer_tree_host_impl->WillBeginImplFrame(args);
 }
@@ -1256,6 +1246,7 @@ void ThreadProxy::InitializeImplOnImplThread(CompletionEvent* completion) {
   impl().scheduler = Scheduler::Create(this,
                                        scheduler_settings,
                                        impl().layer_tree_host_id,
+                                       impl().layer_tree_host_impl.get(),
                                        ImplThreadTaskRunner());
   impl().scheduler->SetVisible(impl().layer_tree_host_impl->visible());
 
@@ -1304,7 +1295,6 @@ void ThreadProxy::LayerTreeHostClosedOnImplThread(CompletionEvent* completion) {
   layer_tree_host()->DeleteContentsTexturesOnImplThread(
       impl().layer_tree_host_impl->resource_provider());
   impl().current_resource_update_controller.reset();
-  impl().layer_tree_host_impl->SetNeedsBeginFrame(false);
   impl().scheduler.reset();
   impl().layer_tree_host_impl.reset();
   impl().weak_factory.InvalidateWeakPtrs();