cc: refactor of MathUtil::AddToTracedValue

cc/trees/layer_tree_host_impl.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_impl.h"
 
 #include <algorithm>
 #include <limits>
 
 #include "base/basictypes.h"
@@ skipping 3280 matching lines @@
 }
 
 void LayerTreeHostImpl::AsValueWithFrameInto(
     FrameData* frame,
     base::debug::TracedValue* state) const {
   if (this->pending_tree_) {
     state->BeginDictionary("activation_state");
     ActivationStateAsValueInto(state);
     state->EndDictionary();
   }
-  state->BeginDictionary("device_viewport_size");
-  MathUtil::AddToTracedValue(device_viewport_size_, state);
-  state->EndDictionary();
+  MathUtil::AddToTracedValue("device_viewport_size", device_viewport_size_,
+                             state);
 
   std::set<const Tile*> tiles;
   active_tree_->GetAllTilesForTracing(&tiles);
   if (pending_tree_)
     pending_tree_->GetAllTilesForTracing(&tiles);
 
   state->BeginArray("active_tiles");
   for (std::set<const Tile*>::const_iterator it = tiles.begin();
        it != tiles.end();
        ++it) {
@@ skipping 194 matching lines @@
 }
 
 void LayerTreeHostImpl::UnregisterPictureLayerImpl(PictureLayerImpl* layer) {
   std::vector<PictureLayerImpl*>::iterator it =
       std::find(picture_layers_.begin(), picture_layers_.end(), layer);
   DCHECK(it != picture_layers_.end());
   picture_layers_.erase(it);
 }
 
 }  // namespace cc