cc: Add SetChildrenNeedBeginFrames() & SendBeginFramesToChildren()

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 4e18a0bcfd5542bc5a0cb6831d99781535e0c7e0..4793cc5ecf5c27d3458a870230af7569bea5d5c0 100644
--- a/cc/trees/thread_proxy.cc
+++ b/cc/trees/thread_proxy.cc
@@ -1095,6 +1095,10 @@ 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();
@@ -1250,6 +1254,10 @@ 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) {