cc: Control activation from the Scheduler

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 65d7980cb47a4bcca06c5012c929a0721111183b..7ac4ee0363bf8eac7c4977a085301c568acb72e5 100644
--- a/cc/trees/single_thread_proxy.cc
+++ b/cc/trees/single_thread_proxy.cc
@@ -236,11 +236,6 @@ void SingleThreadProxy::SetNeedsRedraw(gfx::Rect damage_rect) {
   SetNeedsRedrawRectOnImplThread(damage_rect);
 }
 
-void SingleThreadProxy::OnHasPendingTreeStateChanged(bool have_pending_tree) {
-  // Thread-only feature.
-  NOTREACHED();
-}
-
 void SingleThreadProxy::SetDeferCommits(bool defer_commits) {
   // Thread-only feature.
   NOTREACHED();
@@ -271,6 +266,11 @@ void SingleThreadProxy::OnCanDrawStateChanged(bool can_draw) {
   layer_tree_host_impl_->UpdateBackgroundAnimateTicking(!ShouldComposite());
 }
 
+void SingleThreadProxy::NotifyReadyToActivate() {
+  // Thread-only feature.
+  NOTREACHED();
+}
+
 void SingleThreadProxy::SetNeedsRedrawOnImplThread() {
   layer_tree_host_->ScheduleComposite();
 }