Make SingleThreadProxy a SchedulerClient

cc/trees/layer_tree_host.cc

Index: cc/trees/layer_tree_host.cc
diff --git a/cc/trees/layer_tree_host.cc b/cc/trees/layer_tree_host.cc
index 48f4864ef4a14e903aba2665fa85a989f725ea8a..a5c71c42ee281dd736838cf91facc5707eb58fbe 100644
--- a/cc/trees/layer_tree_host.cc
+++ b/cc/trees/layer_tree_host.cc
@@ -682,8 +682,12 @@ void LayerTreeHost::NotifyInputThrottledUntilCommit() {
 
 void LayerTreeHost::Composite(base::TimeTicks frame_begin_time) {
   DCHECK(!proxy_->HasImplThread());
+  // This function is only valid when not using the scheduler.
+  DCHECK(!settings_.single_thread_proxy_scheduler);
   SingleThreadProxy* proxy = static_cast<SingleThreadProxy*>(proxy_.get());
 
+  SetLayerTreeHostClientReady();
+
   if (output_surface_lost_)
     proxy->CreateAndInitializeOutputSurface();
   if (output_surface_lost_)
@@ -692,6 +696,12 @@ void LayerTreeHost::Composite(base::TimeTicks frame_begin_time) {
   proxy->CompositeImmediately(frame_begin_time);
 }
 
+void LayerTreeHost::CompositeNoSwap(base::TimeTicks frame_begin_time) {
+  DCHECK(!proxy_->HasImplThread());
+  SingleThreadProxy* proxy = static_cast<SingleThreadProxy*>(proxy_.get());
+  proxy->CompositeImmediatelyNoSwap(frame_begin_time);
+}
+
 bool LayerTreeHost::UpdateLayers(ResourceUpdateQueue* queue) {
   DCHECK(!output_surface_lost_);