[UMA] Use proper C++ objects to serialize tracked_objects across process boundaries.

chrome/browser/task_profiler/task_profiler_data_serializer.cc

 // Copyright (c) 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 "chrome/browser/task_profiler/task_profiler_data_serializer.h"
 
 #include "base/file_path.h"
 #include "base/file_util.h"
 #include "base/json/json_string_value_serializer.h"
 #include "base/time.h"
 #include "base/tracked_objects.h"
 #include "content/public/common/content_client.h"
+#include "content/public/common/process_type.h"
+#include "content/public/common/serialized_profiler_data.h"
 #include "googleurl/src/gurl.h"
 
 namespace task_profiler {
 
-bool TaskProfilerDataSerializer::WriteToFile(const FilePath &path) {
+bool TaskProfilerDataSerializer::WriteToFile(const FilePath& path) {
   std::string output;
   JSONStringValueSerializer serializer(&output);
   serializer.set_pretty_print(true);
 
   scoped_ptr<base::DictionaryValue> root(new DictionaryValue());
 
   base::ListValue* snapshot_list = new ListValue();
   base::DictionaryValue* shutdown_snapshot = new DictionaryValue();
   base::ListValue* per_process_data = new ListValue();
 
   root->SetInteger("version", 1);
   root->SetString("userAgent", content::GetUserAgent(GURL()));
 
   // TODO(ramant): Collect data from other processes, then add that data to the
-  // 'per_process_data' array here.
-  base::DictionaryValue* this_process_data =
-      tracked_objects::ThreadData::ToValue(false);
-  per_process_data->Append(this_process_data);
+  // 'per_process_data' array here. Should leverage the TrackingSynchronizer
+  // class to implement this.
+  content::SerializedProfilerData this_process_data(
+      content::PROCESS_TYPE_BROWSER);
+  tracked_objects::ThreadData::ToSerializedProcessData(false,
+                                                       &this_process_data);
+  scoped_ptr<base::DictionaryValue> this_process_data_value(
+      new base::DictionaryValue);
+  this_process_data.ToValue(this_process_data_value.get());
+  per_process_data->Append(this_process_data_value.release());
 
   shutdown_snapshot->SetInteger(
       "timestamp",
       (base::Time::Now() - base::Time::UnixEpoch()).InSeconds());
   shutdown_snapshot->Set("data", per_process_data);
   snapshot_list->Append(shutdown_snapshot);
   root->Set("snapshots", snapshot_list);
 
   serializer.Serialize(*root);
   int data_size = static_cast<int>(output.size());
 
   return data_size == file_util::WriteFile(path, output.data(), data_size);
 }
 
 }  // namespace task_profiler