cc: refactor of MathUtil::AddToTracedValue

cc/resources/picture.cc

 // Copyright 2012 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/resources/picture.h"
 
 #include <algorithm>
 #include <limits>
 #include <set>
 
@@ skipping 452 matching lines @@
   TracedValue::SetIDRef(this, raster_data.get(), "picture_id");
   raster_data->SetDouble("scale", scale);
   return raster_data;
 }
 
 scoped_refptr<base::debug::ConvertableToTraceFormat>
     Picture::AsTraceableRecordData() const {
   scoped_refptr<base::debug::TracedValue> record_data =
       new base::debug::TracedValue();
   TracedValue::SetIDRef(this, record_data.get(), "picture_id");
-  record_data->BeginArray("layer_rect");
-  MathUtil::AddToTracedValue(layer_rect_, record_data.get());
-  record_data->EndArray();
+  MathUtil::AddToTracedValue("layer_rect", layer_rect_, record_data.get());
   return record_data;
 }
 
 }  // namespace cc