cc: Add some tracing below LayerTreeHost::PushProperties.

cc/trees/layer_tree_host.cc

 // Copyright 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/trees/layer_tree_host.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 364 matching lines @@
 
   DCHECK(!sync_tree->ViewportSizeInvalid());
 
   sync_tree->set_has_ever_been_drawn(false);
 
   {
     TRACE_EVENT0("cc", "LayerTreeHost::PushProperties");
     TreeSynchronizer::PushProperties(root_layer(), sync_tree->root_layer());
 
     if (animation_host_) {
+      TRACE_EVENT0("cc", "LayerTreeHost::AnimationHost::PushProperties");
       DCHECK(host_impl->animation_host());
       animation_host_->PushPropertiesTo(host_impl->animation_host());
     }
   }
 
   // This must happen after synchronizing property trees and after push
   // properties, which updates property tree indices.
   sync_tree->UpdatePropertyTreeScrollingAndAnimationFromMainThread();
 
   micro_benchmark_controller_.ScheduleImplBenchmarks(host_impl);
@@ skipping 1040 matching lines @@
 
   // It is required to create new PropertyTrees before deserializing it.
   property_trees_ = PropertyTrees();
   property_trees_.FromProtobuf(proto.property_trees());
 
   surface_id_namespace_ = proto.surface_id_namespace();
   next_surface_sequence_ = proto.next_surface_sequence();
 }
 
 }  // namespace cc