Implement profiler log writing at shutdown

chrome/browser/task_profiler/task_profiler_data_serializer.cc

+// Copyright (c) 2011 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_value_serializer.h"
+#include "base/time.h"
+#include "base/tracked_objects.h"
+#include "content/public/common/content_client.h"
+#include "googleurl/src/gurl.h"
+
+namespace task_profiler {
+
+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);
+
+  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