Forward output glitch information from stream WebRTC log

media/audio/audio_logging.h

Index: media/audio/audio_logging.h
diff --git a/media/audio/audio_logging.h b/media/audio/audio_logging.h
index 4d7551f2021d9eb770e887dd80c25a18caa4a753..e0905f206693b175b95f08494446227f6b6f7970 100644
--- a/media/audio/audio_logging.h
+++ b/media/audio/audio_logging.h
@@ -10,6 +10,7 @@
 #include "base/memory/scoped_ptr.h"
 
 namespace media {
+
 class AudioParameters;
 
 // AudioLog logs state information about an active audio component.  Each method
@@ -82,6 +83,16 @@ class AudioLogFactory {
   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_