Keep vsync enabled while there is a pending requestAnimationFrame

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 3cc54e64b5524c134e4f3232982201e5925e1b1b..0ce230b9da54cad15177e0a5a3e93ce2fbbf433e 100644
--- a/cc/trees/thread_proxy.cc
+++ b/cc/trees/thread_proxy.cc
@@ -268,6 +268,9 @@ void ThreadProxy::SetNeedsAnimate() {
   TRACE_EVENT0("cc", "ThreadProxy::SetNeedsAnimate");
   animate_requested_ = true;
 
+  Proxy::ImplThread()->PostTask(base::Bind(
+      &ThreadProxy::SetAnimateRequestedOnImplThread, impl_thread_weak_ptr_));
+
   if (commit_request_sent_to_impl_thread_)
     return;
   commit_request_sent_to_impl_thread_ = true;
@@ -367,6 +370,12 @@ void ThreadProxy::SetNeedsCommitOnImplThread() {
   scheduler_on_impl_thread_->SetNeedsCommit();
 }
 
+void ThreadProxy::SetAnimateRequestedOnImplThread() {
+  DCHECK(IsImplThread());
+  TRACE_EVENT0("cc", "ThreadProxy::SetAnimateRequestedOnImplThread");
+  scheduler_on_impl_thread_->SetAnimateRequested();
+}
+
 void ThreadProxy::SetNeedsManageTilesOnImplThread() {
   if (manage_tiles_pending_)
     return;