Add builders for tracing event's structural arguments

cc/debug/traced_picture.cc

 // Copyright (c) 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/debug/traced_picture.h"
 
 #include "base/json/json_writer.h"
 #include "base/strings/stringprintf.h"
 #include "base/values.h"
-#include "cc/debug/traced_value.h"
 
 namespace cc {
 
 TracedPicture::TracedPicture(scoped_refptr<const Picture> picture)
     : picture_(picture), is_alias_(false) {}
 
 TracedPicture::~TracedPicture() {
 }
 
 scoped_refptr<base::debug::ConvertableToTraceFormat>
@@ skipping 29 matching lines @@
 }
 
 void TracedPicture::AppendPicture(std::string* out) const {
   scoped_ptr<base::Value> value = picture_->AsValue();
   std::string tmp;
   base::JSONWriter::Write(value.get(), &tmp);
   out->append(tmp);
 }
 
 }  // namespace cc