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

BUG=357683

NOTRY=true

TESTED= try jobs passed

Review URL: https://codereview.chromium.org/217303002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@260305 0039d316-1c4b-4281-b951-d872f2087c98

content/browser/renderer_host/media/media_stream_manager.cc

@@ -11,6 +11,7 @@
 #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"
@@ -359,12 +360,24 @@ MediaStreamManager::MediaStreamManager(media::AudioManager* audio_manager)
         base::Bind(&MediaStreamManager::InitializeDeviceManagersOnIOThread,
                    base::Unretained(this)));
   }
+
+  base::PowerMonitor* power_monitor = base::PowerMonitor::Get();
+  // BrowserMainLoop always creates the PowerMonitor instance before creating
+  // MediaStreamManager, but power_monitor may be NULL in unit tests.
+  if (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();
+  // The PowerMonitor instance owned by BrowserMainLoops always outlives the
+  // MediaStreamManager, but it may be NULL in unit tests.
+  if (power_monitor)
+    power_monitor->RemoveObserver(this);
 }
 
 VideoCaptureManager* MediaStreamManager::video_capture_manager() {
@@ -1592,6 +1605,14 @@ void MediaStreamManager::SendMessageToNativeLog(const std::string& message) {
       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));

content/browser/renderer_host/media/media_stream_manager.h

@@ -31,6 +31,7 @@
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop/message_loop.h"
+#include "base/power_monitor/power_observer.h"
 #include "base/system_monitor/system_monitor.h"
 #include "content/browser/renderer_host/media/media_stream_provider.h"
 #include "content/common/content_export.h"
@@ -57,6 +58,7 @@ class VideoCaptureManager;
 class CONTENT_EXPORT MediaStreamManager
     : public MediaStreamProviderListener,
       public base::MessageLoop::DestructionObserver,
+      public base::PowerObserver,
       public base::SystemMonitor::DevicesChangedObserver {
  public:
   // Callback to deliver the result of a media request.
@@ -193,6 +195,10 @@ class CONTENT_EXPORT MediaStreamManager
   // logging from webrtcLoggingPrivate API. Safe to call from any thread.
   static void SendMessageToNativeLog(const std::string& message);
 
+  // base::PowerObserver overrides.
+  virtual void OnSuspend() OVERRIDE;
+  virtual void OnResume() OVERRIDE;
+
  protected:
   // Used for testing.
   MediaStreamManager();