Add builders for tracing event's structural arguments

cc/quads/picture_draw_quad.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/quads/picture_draw_quad.h"
 
+#include "base/debug/trace_event_argument.h"
 #include "base/values.h"
 #include "cc/base/math_util.h"
 #include "cc/resources/platform_color.h"
 
 namespace cc {
 
 PictureDrawQuad::PictureDrawQuad() {
 }
 
 PictureDrawQuad::~PictureDrawQuad() {
@@ skipping 55 matching lines @@
     const ResourceIteratorCallback& callback) {
   // TODO(danakj): Convert to TextureDrawQuad?
   NOTIMPLEMENTED();
 }
 
 const PictureDrawQuad* PictureDrawQuad::MaterialCast(const DrawQuad* quad) {
   DCHECK(quad->material == DrawQuad::PICTURE_CONTENT);
   return static_cast<const PictureDrawQuad*>(quad);
 }
 
-void PictureDrawQuad::ExtendValue(base::DictionaryValue* value) const {
+void PictureDrawQuad::ExtendValue(base::debug::TracedValue* value) const {
   ContentDrawQuadBase::ExtendValue(value);
-  value->Set("content_rect", MathUtil::AsValue(content_rect).release());
+  value->BeginArray("content_rect");
+  MathUtil::AddToTracedValue(content_rect, value);
+  value->EndArray();
   value->SetDouble("contents_scale", contents_scale);
   value->SetInteger("texture_format", texture_format);
   // TODO(piman): picture_pile?
 }
 
 }  // namespace cc