cc: Create ProxyBeginFrameSource

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 c343c97e7064859cf91cd169a8290022b5944da3..9a1d592cc822d37a8db20e5401f163142eb6785e 100644
--- a/cc/trees/thread_proxy.cc
+++ b/cc/trees/thread_proxy.cc
@@ -1107,10 +1107,6 @@ void ThreadProxy::DidBeginImplFrameDeadline() {
   impl().layer_tree_host_impl->ResetCurrentBeginFrameArgsForNextFrame();
 }
 
-void ThreadProxy::SendBeginFramesToChildren(const BeginFrameArgs& args) {
-  NOTREACHED() << "Only used by SingleThreadProxy";
-}
-
 void ThreadProxy::ReadyToFinalizeTextureUpdates() {
   DCHECK(IsImplThread());
   impl().scheduler->NotifyReadyToCommit();
@@ -1144,7 +1140,8 @@ void ThreadProxy::InitializeImplOnImplThread(CompletionEvent* completion) {
                          impl().layer_tree_host_id,
                          ImplThreadTaskRunner(),
                          base::PowerMonitor::Get(),
-                         impl().external_begin_frame_source.Pass());
+                         impl().external_begin_frame_source.Pass(),
+                         NULL);
   impl().scheduler->SetVisible(impl().layer_tree_host_impl->visible());
   impl_thread_weak_ptr_ = impl().weak_factory.GetWeakPtr();
   completion->Signal();
@@ -1266,10 +1263,6 @@ bool ThreadProxy::MainFrameWillHappenForTesting() {
   return main_frame_will_happen;
 }
 
-void ThreadProxy::SetChildrenNeedBeginFrames(bool children_need_begin_frames) {
-  NOTREACHED() << "Only used by SingleThreadProxy";
-}
-
 void ThreadProxy::MainFrameWillHappenOnImplThreadForTesting(
     CompletionEvent* completion,
     bool* main_frame_will_happen) {