mac: Add profiling for MediaStreamManager::StartMonitoringOnUIThread.

content/browser/renderer_host/media/media_stream_manager.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 "content/browser/renderer_host/media/media_stream_manager.h"
 
 #include <list>
 #include <vector>
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
 #include "base/logging.h"
 #include "base/power_monitor/power_monitor.h"
+#include "base/profiler/scoped_tracker.h"
 #include "base/rand_util.h"
 #include "base/run_loop.h"
 #include "base/strings/stringprintf.h"
 #include "base/threading/thread.h"
 #include "content/browser/browser_main_loop.h"
 #include "content/browser/media/capture/web_contents_capture_util.h"
 #include "content/browser/renderer_host/media/audio_input_device_manager.h"
 #include "content/browser/renderer_host/media/media_capture_devices_impl.h"
 #include "content/browser/renderer_host/media/media_stream_requester.h"
 #include "content/browser/renderer_host/media/media_stream_ui_proxy.h"
@@ skipping 933 matching lines @@
   }
 
   std::ostringstream oss;
   oss << "Media input device removed: type = " <<
     (device.type == MEDIA_DEVICE_AUDIO_CAPTURE ? "audio" : "video") <<
     ", id = " << device.id << ", name = " << device.name;
   AddLogMessageOnIOThread(oss.str());
 }
 
 void MediaStreamManager::StartMonitoring() {
+  // TODO(erikchen): Remove ScopedTracker below once crbug.com/458404 is fixed.
+  tracked_objects::ScopedTracker tracking_profile1(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "458404 MediaStreamManager::StartMonitoring"));
+
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
   if (monitoring_started_)
     return;
 
   if (!base::SystemMonitor::Get())
     return;
 
   monitoring_started_ = true;
   base::SystemMonitor::Get()->AddDevicesChangedObserver(this);
 
+  // TODO(erikchen): Remove ScopedTracker below once crbug.com/458404 is fixed.
+  tracked_objects::ScopedTracker tracking_profile2(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "458404 MediaStreamManager::StartMonitoring::EnumerateAudio"));
   // Enumerate both the audio and video devices to cache the device lists
   // and send them to media observer.
   ++active_enumeration_ref_count_[MEDIA_DEVICE_AUDIO_CAPTURE];
   audio_input_device_manager_->EnumerateDevices(MEDIA_DEVICE_AUDIO_CAPTURE);
+
+  // TODO(erikchen): Remove ScopedTracker below once crbug.com/458404 is fixed.
+  tracked_objects::ScopedTracker tracking_profile3(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "458404 MediaStreamManager::StartMonitoring::EnumerateVideo"));
   ++active_enumeration_ref_count_[MEDIA_DEVICE_VIDEO_CAPTURE];
   video_capture_manager_->EnumerateDevices(MEDIA_DEVICE_VIDEO_CAPTURE);
 
 #if defined(OS_MACOSX)
   BrowserThread::PostTask(
       BrowserThread::UI, FROM_HERE,
       base::Bind(&MediaStreamManager::StartMonitoringOnUIThread,
                  base::Unretained(this)));
 #endif
 }
@@ skipping 1169 matching lines @@
   }
 }
 
 void MediaStreamManager::SetKeyboardMicOnDeviceThread() {
   DCHECK(device_task_runner_->BelongsToCurrentThread());
   audio_manager_->SetHasKeyboardMic();
 }
 #endif
 
 }  // namespace content