cc: Add some tracing below LayerTreeHost::PushProperties.

cc/layers/ui_resource_layer.cc

 // Copyright 2013 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/layers/ui_resource_layer.h"
 
+#include "base/trace_event/trace_event.h"
 #include "cc/layers/ui_resource_layer_impl.h"
 #include "cc/resources/scoped_ui_resource.h"
 #include "cc/resources/ui_resource_bitmap.h"
 #include "cc/trees/layer_tree_host.h"
 
 namespace cc {
 
 
 namespace {
 
@@ skipping 125 matching lines @@
   SetNeedsCommit();
 }
 
 bool UIResourceLayer::HasDrawableContent() const {
   return ui_resource_holder_ && ui_resource_holder_->id() &&
          Layer::HasDrawableContent();
 }
 
 void UIResourceLayer::PushPropertiesTo(LayerImpl* layer) {
   Layer::PushPropertiesTo(layer);
+  TRACE_EVENT0("cc", "UIResourceLayer::PushPropertiesTo");
   UIResourceLayerImpl* layer_impl = static_cast<UIResourceLayerImpl*>(layer);
 
   if (!ui_resource_holder_) {
     layer_impl->SetUIResourceId(0);
   } else {
     DCHECK(layer_tree_host());
 
     gfx::Size image_size =
         layer_tree_host()->GetUIResourceSize(ui_resource_holder_->id());
     layer_impl->SetUIResourceId(ui_resource_holder_->id());
     layer_impl->SetImageBounds(image_size);
     layer_impl->SetUV(uv_top_left_, uv_bottom_right_);
     layer_impl->SetVertexOpacity(vertex_opacity_);
   }
 }
 
 }  // namespace cc