Add Set Authoritative VSync Interval function

cc/trees/single_thread_proxy.cc

Index: cc/trees/single_thread_proxy.cc
diff --git a/cc/trees/single_thread_proxy.cc b/cc/trees/single_thread_proxy.cc
index 6498f0e0996ce49b310eb9a1c7a5d83bcfbfe4df..1f067d934f57ec2447768f9c06fa9d451c49c67c 100644
--- a/cc/trees/single_thread_proxy.cc
+++ b/cc/trees/single_thread_proxy.cc
@@ -638,6 +638,11 @@ void SingleThreadProxy::SetChildrenNeedBeginFrames(
       children_need_begin_frames);
 }
 
+void SingleThreadProxy::SetAuthoritativeVSyncInterval(
+    base::TimeDelta interval) {
+  scheduler_on_impl_thread_->SetAuthoritativeVSyncInterval(interval);
+}
+
 void SingleThreadProxy::WillBeginImplFrame(const BeginFrameArgs& args) {
   layer_tree_host_impl_->WillBeginImplFrame(args);
 }