Track parent-child relations during profiling

content/browser/profiler_message_filter.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 "content/browser/profiler_message_filter.h"
 
 #include "base/tracked_objects.h"
 #include "base/values.h"
 #include "content/browser/profiler_controller_impl.h"
 #include "content/common/child_process_messages.h"
 
 using content::BrowserMessageFilter;
 using content::BrowserThread;
 
 ProfilerMessageFilter::ProfilerMessageFilter() {
 }
 
 ProfilerMessageFilter::~ProfilerMessageFilter() {
 }
 
 void ProfilerMessageFilter::OnChannelConnected(int32 peer_pid) {
   BrowserMessageFilter::OnChannelConnected(peer_pid);
 
-  bool enable = tracked_objects::ThreadData::tracking_status();
-  Send(new ChildProcessMsg_SetProfilerStatus(enable));
+  tracked_objects::ThreadData::Status status =
+      tracked_objects::ThreadData::status();
+  Send(new ChildProcessMsg_SetProfilerStatus(status));
 }
 
 bool ProfilerMessageFilter::OnMessageReceived(const IPC::Message& message,
                                               bool* message_was_ok) {
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP_EX(ProfilerMessageFilter, message, *message_was_ok)
     IPC_MESSAGE_HANDLER(ChildProcessHostMsg_ChildProfilerData,
                         OnChildProfilerData)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP_EX()
   return handled;
 }
 
 void ProfilerMessageFilter::OnChildProfilerData(
     int sequence_number,
     const base::DictionaryValue& profiler_data) {
   base::DictionaryValue* dictionary_value = new base::DictionaryValue;
   dictionary_value->MergeDictionary(&profiler_data);
   // OnProfilerDataCollected assumes the ownership of profiler_data.
   content::ProfilerControllerImpl::GetInstance()->OnProfilerDataCollected(
       sequence_number, dictionary_value);
 }