Improve logging related to start/stop and failure of audio input streams in Chrome

media/audio/audio_input_controller.h

Index: media/audio/audio_input_controller.h
diff --git a/media/audio/audio_input_controller.h b/media/audio/audio_input_controller.h
index e1e14ee3c30e94b07ed34f0043e215b635a94168..b25d5be01c1aa356730ed557c0112d82e82af35e 100644
--- a/media/audio/audio_input_controller.h
+++ b/media/audio/audio_input_controller.h
@@ -84,7 +84,8 @@ class UserInputMonitor;
 
 class MEDIA_EXPORT AudioInputController
     : public base::RefCountedThreadSafe<AudioInputController>,
-      public AudioInputStream::AudioInputCallback {
+      public AudioInputStream::AudioInputCallback,
+      public AudioManager::StateChangeListener {
  public:
 
   // Error codes to make native loggin more clear. These error codes are added
@@ -234,6 +235,8 @@ class MEDIA_EXPORT AudioInputController
                       double volume) OVERRIDE;
   virtual void OnError(AudioInputStream* stream) OVERRIDE;
 
+  virtual void OnStateChange(const std::string state) OVERRIDE;
+
   bool SharedMemoryAndSyncSocketMode() const { return sync_writer_ != NULL; }
 
  protected:
@@ -260,14 +263,14 @@ class MEDIA_EXPORT AudioInputController
   };
 #endif
 
-  AudioInputController(EventHandler* handler,
+  AudioInputController(AudioManager* audio_manager,
+                       EventHandler* handler,
                        SyncWriter* sync_writer,
                        UserInputMonitor* user_input_monitor);
   virtual ~AudioInputController();
 
   // Methods called on the audio thread (owned by the AudioManager).
-  void DoCreate(AudioManager* audio_manager, const AudioParameters& params,
-                const std::string& device_id);
+  void DoCreate(const AudioParameters& params, const std::string& device_id);
   void DoCreateForStream(AudioInputStream* stream_to_control);
   void DoRecord();
   void DoClose();
@@ -305,6 +308,8 @@ class MEDIA_EXPORT AudioInputController
   // notifications from this class.
   EventHandler* handler_;
 
+  media::AudioManager* audio_manager_;

[no longer working on chromium, 2014/08/25 08:20:05]

nit, media::AudioManager* const

[henrika (OOO until Aug 14), 2014/08/25 12:47:44]

const media::AudioManager* audio_manager_ does not work actually since I am not
allowed to add listeners then. Can't compile.

+
   // Pointer to the audio input stream object.
   AudioInputStream* stream_;