Adds power state suspend/resume messages to the webrtc native log.

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/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/device_request_message_filter.h"
 #include "content/browser/renderer_host/media/media_capture_devices_impl.h"
 #include "content/browser/renderer_host/media/media_stream_requester.h"
@@ skipping 322 matching lines @@
   // Some unit tests create the MSM in the IO thread and assumes the
   // initialization is done synchronously.
   if (BrowserThread::CurrentlyOn(BrowserThread::IO)) {
     InitializeDeviceManagersOnIOThread();
   } else {
     BrowserThread::PostTask(
         BrowserThread::IO, FROM_HERE,
         base::Bind(&MediaStreamManager::InitializeDeviceManagersOnIOThread,
                    base::Unretained(this)));
   }
+
+  base::PowerMonitor* power_monitor = base::PowerMonitor::Get();

[vrk (LEFT CHROMIUM), 2014/03/28 18:29:47]

Can you add a comment explaining why PowerMonitor is guaranteed to be non-null?

+  DCHECK(power_monitor);
+  power_monitor->AddObserver(this);
 }
 
 MediaStreamManager::~MediaStreamManager() {
   DVLOG(1) << "~MediaStreamManager";
   DCHECK(requests_.empty());
   DCHECK(!device_task_runner_);
+
+  base::PowerMonitor* power_monitor = base::PowerMonitor::Get();
+  DCHECK(power_monitor);

[vrk (LEFT CHROMIUM), 2014/03/28 18:29:47]

Ditto above.

+  power_monitor->RemoveObserver(this);
 }
 
 VideoCaptureManager* MediaStreamManager::video_capture_manager() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   DCHECK(video_capture_manager_.get());
   return video_capture_manager_.get();
 }
 
 AudioInputDeviceManager* MediaStreamManager::audio_input_device_manager() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
@@ skipping 1202 matching lines @@
   DCHECK_GE(active_enumeration_ref_count_[stream_type], 0);
 }
 
 // static
 void MediaStreamManager::SendMessageToNativeLog(const std::string& message) {
   BrowserThread::PostTask(
       BrowserThread::UI, FROM_HERE,
       base::Bind(DoAddLogMessage, message));
 }
 
+void MediaStreamManager::OnSuspend() {
+  SendMessageToNativeLog("Power state suspended.");
+}
+
+void MediaStreamManager::OnResume() {
+  SendMessageToNativeLog("Power state resumed.");
+}
+
 void MediaStreamManager::AddLogMessageOnIOThread(const std::string& message) {
   // Get render process ids on the IO thread.
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 
   // Grab all unique process ids that request a MediaStream or have a
   // MediaStream running.
   std::set<int> requesting_process_ids;
   for (DeviceRequests::const_iterator it = requests_.begin();
        it != requests_.end(); ++it) {
     DeviceRequest* request = it->second;
@@ skipping 287 matching lines @@
       if (it->device.type == MEDIA_DESKTOP_VIDEO_CAPTURE) {
         video_capture_manager_->SetDesktopCaptureWindowId(it->session_id,
                                                           window_id);
         break;
       }
     }
   }
 }
 
 }  // namespace content