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

media/audio/audio_manager.h

Index: media/audio/audio_manager.h
diff --git a/media/audio/audio_manager.h b/media/audio/audio_manager.h
index 915308ef77d89cfea1470ee0b1696d44b5b94e12..e2a5adaf20111a432323a98137782e88ba51010c 100644
--- a/media/audio/audio_manager.h
+++ b/media/audio/audio_manager.h
@@ -145,6 +145,14 @@ class MEDIA_EXPORT AudioManager {
   virtual void RemoveOutputDeviceChangeListener(
       AudioDeviceListener* listener) = 0;
 
+  class StateChangeListener {

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

you probably need Dale to look at the change in AudioManager.

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

I was thinking of asking Dale or Tommi for a second opinion, yes. Wanted OK from
you guys first.

+   public:
+    virtual void OnStateChange(const std::string state) = 0;

[Henrik Grunell, 2014/08/22 16:14:43]

const std::string&

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

Done.

+  };
+
+  virtual void AddStateChangeListener(StateChangeListener* listener) = 0;
+  virtual void RemoveStateChangeListener(StateChangeListener* listener) = 0;
+
   // Returns the default output hardware audio parameters for opening output
   // streams. It is a convenience interface to
   // AudioManagerBase::GetPreferredOutputStreamParameters and each AudioManager