cc: Add frame data to LTHI tracing

cc/debug/traced_value.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_value.h"
 
 #include "base/json/json_writer.h"
 #include "base/strings/stringprintf.h"
 #include "base/values.h"
 
 namespace cc {
 
 scoped_ptr<base::Value> TracedValue::CreateIDRef(const void* id) {
   scoped_ptr<base::DictionaryValue> res(new base::DictionaryValue());
   res->SetString("id_ref", base::StringPrintf("%p", id));
   return res.PassAs<base::Value>();
 }
 
 void TracedValue::MakeDictIntoImplicitSnapshot(
     base::DictionaryValue* dict, const char* object_name, const void* id) {
   dict->SetString("id", base::StringPrintf("%s/%p", object_name, id));
 }
 
+void TracedValue::MakeDictIntoImplicitSnapshotWithCategory(
+    const char* category,
+    base::DictionaryValue* dict,
+    const char* object_name,
+    const void* id) {
+  dict->SetString("cat", category);
+  MakeDictIntoImplicitSnapshot(dict, object_name, id);
+}
+
 scoped_ptr<base::debug::ConvertableToTraceFormat> TracedValue::FromValue(
     base::Value* value) {
   TracedValue* ptr = new TracedValue(value);
   scoped_ptr<TracedValue> result(ptr);
   return result.PassAs<base::debug::ConvertableToTraceFormat>();
 }
 
 TracedValue::TracedValue(base::Value* value)
   : value_(value) {
 }
 
 TracedValue::~TracedValue() {
 }
 
 void TracedValue::AppendAsTraceFormat(std::string* out) const {
   std::string tmp;
   base::JSONWriter::Write(value_.get(), &tmp);
   *out += tmp;
 }
 
 }  // namespace cc