Add Set Authoritative VSync Interval function

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 73bf79e5f4eb6d3f6b8a4979187b99aa642c7120..66007a919544df460add1c7896f5d19148391658 100644
--- a/cc/trees/thread_proxy.cc
+++ b/cc/trees/thread_proxy.cc
@@ -1251,6 +1251,10 @@ void ThreadProxy::SetChildrenNeedBeginFrames(bool children_need_begin_frames) {
   NOTREACHED() << "Only used by SingleThreadProxy";
 }
 
+void ThreadProxy::SetAuthoritativeVSyncInterval(base::TimeDelta interval) {
+  NOTREACHED() << "Only used by SingleThreadProxy";

[brianderson, 2014/12/12 01:11:39]

I think this will be true after CrOS is STP. If you want to land it before then
you'll need to forward it to the impl thread.

+}
+
 void ThreadProxy::MainFrameWillHappenOnImplThreadForTesting(
     CompletionEvent* completion,
     bool* main_frame_will_happen) {