Forward output glitch information from stream WebRTC log

media/audio/audio_logging.h

 // Copyright 2013 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_LOGGING_H_
 #define MEDIA_AUDIO_AUDIO_LOGGING_H_
 
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
 
 namespace media {
+
 class AudioParameters;
 
 // AudioLog logs state information about an active audio component.  Each method
 // takes a |component_id| along with method specific information.  Its methods
 // are safe to call from any thread.
 class AudioLog {
  public:
   virtual ~AudioLog() {}
 
   // Called when an audio component is created.  |params| are the parameters of
@@ skipping 52 matching lines @@
 
   // Create a new AudioLog object for tracking the behavior for one or more
   // instances of the given component.  Each instance of an "owning" class must
   // create its own AudioLog.
   virtual scoped_ptr<AudioLog> CreateAudioLog(AudioComponent component) = 0;
 
  protected:
   virtual ~AudioLogFactory() {}
 };
 
+// Callback function used for writing to native WebRTC log from media.
+typedef void (*WebRtcLoggingCallback)(const std::string&);
+
+// Function that the embedder calls to set the callback. Must only be called
+// once.
+void InitWebRtcLoggingCallback(WebRtcLoggingCallback callback);
+
+// Function that media code calls to log. Forwards to callback function if set.
+void WebRtcLogMessage(const std::string& message);
+
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_AUDIO_LOGGING_H_