cc: refactor of RenderingStats::TimeDeltaList::AddToTracedValue

cc/debug/rendering_stats_unittest.cc

 // Copyright 2014 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 <string>
 
 #include "base/time/time.h"
 #include "base/values.h"
 #include "cc/debug/rendering_stats.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace cc {
 namespace {
 
 static std::string ToString(const RenderingStats::TimeDeltaList& list) {
   scoped_refptr<base::debug::TracedValue> value =
       new base::debug::TracedValue();
-  value->BeginArray("list_value");
-  list.AddToTracedValue(value.get());
-  value->EndArray();
+  list.AddToTracedValue("list_value", value.get());
   return value->ToString();
 }
 
 TEST(RenderingStatsTest, TimeDeltaListEmpty) {
   RenderingStats::TimeDeltaList time_delta_list;
   EXPECT_EQ("{\"list_value\":[]}", ToString(time_delta_list));
 }
 
 TEST(RenderingStatsTest, TimeDeltaListNonEmpty) {
   RenderingStats::TimeDeltaList time_delta_list;
@@ skipping 13 matching lines @@
   time_delta_list_b.Append(base::TimeDelta::FromMilliseconds(938));
   time_delta_list_b.Append(base::TimeDelta::FromMilliseconds(2));
 
   time_delta_list_a.Add(time_delta_list_b);
   EXPECT_EQ("{\"list_value\":[810.0,32.0,43.0,938.0,2.0]}",
             ToString(time_delta_list_a));
 }
 
 }  // namespace
 }  // namespace cc