Added initial set of logging for AudioOutputController.

media/audio/audio_output_controller.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_OUTPUT_CONTROLLER_H_
 #define MEDIA_AUDIO_AUDIO_OUTPUT_CONTROLLER_H_
 
 #include <stdint.h>
 #include <memory>
 #include <set>
@@ skipping 57 matching lines @@
       NON_EXPORTED_BASE(public AudioManager::AudioDeviceListener)  {
  public:
   // An event handler that receives events from the AudioOutputController. The
   // following methods are called on the audio manager thread.
   class MEDIA_EXPORT EventHandler {
    public:
     virtual void OnControllerCreated() = 0;
     virtual void OnControllerPlaying() = 0;
     virtual void OnControllerPaused() = 0;
     virtual void OnControllerError() = 0;
+    virtual void OnLog(const std::string& message) = 0;
 
    protected:
     virtual ~EventHandler() {}
   };
 
   // A synchronous reader interface used by AudioOutputController for
   // synchronous reading.
   // TODO(crogers): find a better name for this class and the Read() method
   // now that it can handle synchronized I/O.
   class SyncReader {
@@ skipping 180 matching lines @@
   // be accessed while |error_lock_| is held.
   bool ignore_errors_during_stop_close_;
   base::Lock error_lock_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioOutputController);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_AUDIO_OUTPUT_CONTROLLER_H_