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 0f7a2a3dee6baae9dd219c6d3c02f36c4025af2e..0dd8a10ed4de77131e2c2503b0a5c8962dd2aad4 100644
--- a/cc/trees/thread_proxy.cc
+++ b/cc/trees/thread_proxy.cc
@@ -1125,6 +1125,10 @@ 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();
@@ -1280,6 +1284,10 @@ 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) {