Add builders for tracing event's structural arguments

cc/quads/draw_quad.h

 // 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.
 
 #ifndef CC_QUADS_DRAW_QUAD_H_
 #define CC_QUADS_DRAW_QUAD_H_
 
 #include "base/callback.h"
 #include "cc/base/cc_export.h"
 #include "cc/quads/shared_quad_state.h"
 #include "cc/resources/resource_provider.h"
 
 namespace base {
+namespace debug {
+class TracedValue;
+}
 class Value;
 class DictionaryValue;
 }
 
 namespace cc {
 
 // DrawQuad is a bag of data used for drawing a quad. Because different
 // materials need different bits of per-quad data to render, classes that derive
 // from DrawQuad store additional data in their derived instance. The Material
 // enum is used to "safely" downcast to the derived class.
@@ skipping 92 matching lines @@
   bool IsBottomEdge() const {
     return rect.bottom() == shared_quad_state->content_bounds.height();
   }
 
   // Is any edge of this tile aligned with the originating layer's
   // corresponding edge?
   bool IsEdge() const {
     return IsLeftEdge() || IsTopEdge() || IsRightEdge() || IsBottomEdge();
   }
 
-  scoped_ptr<base::Value> AsValue() const;
+  void AsValueInto(base::debug::TracedValue* value) const;
 
  protected:
   DrawQuad();
 
   void SetAll(const SharedQuadState* shared_quad_state,
               Material material,
               const gfx::Rect& rect,
               const gfx::Rect& opaque_rect,
               const gfx::Rect& visible_rect,
               bool needs_blending);
-  virtual void ExtendValue(base::DictionaryValue* value) const = 0;
+  virtual void ExtendValue(base::debug::TracedValue* value) const = 0;
 };
 
 }  // namespace cc
 
 #endif  // CC_QUADS_DRAW_QUAD_H_