Update from https://crrev.com/305340

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 4cb0a9e2562df52905f8be47a1b96bae0df9cc0f..5a40d7e5039dc38c3e92b2a7c1ed0257391b9824 100644
--- a/cc/trees/single_thread_proxy.cc
+++ b/cc/trees/single_thread_proxy.cc
@@ -103,7 +103,7 @@ void SingleThreadProxy::SetLayerTreeHostClientReady() {
 }
 
 void SingleThreadProxy::SetVisible(bool visible) {
-  TRACE_EVENT0("cc", "SingleThreadProxy::SetVisible");
+  TRACE_EVENT1("cc", "SingleThreadProxy::SetVisible", "visible", visible);
   DebugScopedSetImplThread impl(this);
   layer_tree_host_impl_->SetVisible(visible);
   if (scheduler_on_impl_thread_)
@@ -492,10 +492,9 @@ void SingleThreadProxy::CompositeImmediately(base::TimeTicks frame_begin_time) {
   }
 
   {
-    BeginFrameArgs begin_frame_args(
-        BeginFrameArgs::Create(frame_begin_time,
-                               base::TimeTicks(),
-                               BeginFrameArgs::DefaultInterval()));
+    BeginFrameArgs begin_frame_args(BeginFrameArgs::Create(
+        frame_begin_time, base::TimeTicks(), BeginFrameArgs::DefaultInterval(),
+        BeginFrameArgs::SYNCHRONOUS));
     DoBeginMainFrame(begin_frame_args);
     DoCommit();
 
@@ -634,6 +633,12 @@ bool SingleThreadProxy::MainFrameWillHappenForTesting() {
   return false;
 }
 
+void SingleThreadProxy::SetChildrenNeedBeginFrames(
+    bool children_need_begin_frames) {
+  scheduler_on_impl_thread_->SetChildrenNeedBeginFrames(
+      children_need_begin_frames);
+}
+
 void SingleThreadProxy::WillBeginImplFrame(const BeginFrameArgs& args) {
   layer_tree_host_impl_->WillBeginImplFrame(args);
 }
@@ -792,4 +797,8 @@ void SingleThreadProxy::DidBeginImplFrameDeadline() {
   layer_tree_host_impl_->ResetCurrentBeginFrameArgsForNextFrame();
 }
 
+void SingleThreadProxy::SendBeginFramesToChildren(const BeginFrameArgs& args) {
+  layer_tree_host_->SendBeginFramesToChildren(args);
+}
+
 }  // namespace cc