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

media/audio/audio_manager.h

 // 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.
 
 #ifndef MEDIA_AUDIO_AUDIO_MANAGER_H_
 #define MEDIA_AUDIO_AUDIO_MANAGER_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 127 matching lines @@
   // callback is to recreate the stream.
   class AudioDeviceListener {
    public:
     virtual void OnDeviceChange() = 0;
   };
 
   virtual void AddOutputDeviceChangeListener(AudioDeviceListener* listener) = 0;
   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
   // does not need their own implementation to this interface.
   // TODO(tommi): Remove this method and use GetOutputStreamParameteres instead.
   virtual AudioParameters GetDefaultOutputStreamParameters() = 0;
 
   // Returns the output hardware audio parameters for a specific output device.
   virtual AudioParameters GetOutputStreamParameters(
       const std::string& device_id) = 0;
@@ skipping 22 matching lines @@
  protected:
   AudioManager();
 
  private:
   DISALLOW_COPY_AND_ASSIGN(AudioManager);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_AUDIO_MANAGER_H_