Add builders for tracing event's structural arguments

cc/resources/picture_layer_tiling_set.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_layer_tiling_set.h"
 
 #include <limits>
 
 namespace cc {
 
@@ skipping 299 matching lines @@
 void PictureLayerTilingSet::DidBecomeActive() {
   for (size_t i = 0; i < tilings_.size(); ++i)
     tilings_[i]->DidBecomeActive();
 }
 
 void PictureLayerTilingSet::DidBecomeRecycled() {
   for (size_t i = 0; i < tilings_.size(); ++i)
     tilings_[i]->DidBecomeRecycled();
 }
 
-scoped_ptr<base::Value> PictureLayerTilingSet::AsValue() const {
-  scoped_ptr<base::ListValue> state(new base::ListValue());
-  for (size_t i = 0; i < tilings_.size(); ++i)
-    state->Append(tilings_[i]->AsValue().release());
-  return state.PassAs<base::Value>();
+void PictureLayerTilingSet::AsValueInto(base::debug::TracedValue* state) const {
+  for (size_t i = 0; i < tilings_.size(); ++i) {
+    state->BeginDictionary();
+    tilings_[i]->AsValueInto(state);
+    state->EndDictionary();
+  }
 }
 
 size_t PictureLayerTilingSet::GPUMemoryUsageInBytes() const {
   size_t amount = 0;
   for (size_t i = 0; i < tilings_.size(); ++i)
     amount += tilings_[i]->GPUMemoryUsageInBytes();
   return amount;
 }
 
 PictureLayerTilingSet::TilingRange PictureLayerTilingSet::GetTilingRange(
@@ skipping 21 matching lines @@
       return low_res_range;
     case LOWER_THAN_LOW_RES:
       return TilingRange(low_res_range.end, tilings_.size());
   }
 
   NOTREACHED();
   return TilingRange(0, 0);
 }
 
 }  // namespace cc