Attempt to fix audio wedges by restarting all streams.

media/audio/audio_output_dispatcher.h

Index: media/audio/audio_output_dispatcher.h
diff --git a/media/audio/audio_output_dispatcher.h b/media/audio/audio_output_dispatcher.h
index 5004fa06afd962da215713d95527a9b23da0a93f..ac696348c4880a431fa8a42da29d073043dd9c32 100644
--- a/media/audio/audio_output_dispatcher.h
+++ b/media/audio/audio_output_dispatcher.h
@@ -66,6 +66,13 @@ class MEDIA_EXPORT AudioOutputDispatcher
   // Called on the audio thread when the AudioManager is shutting down.
   virtual void Shutdown() = 0;
 
+  // Called by the AudioManager to restart streams when a wedge is detected.  A
+  // wedge means the OS failed to request any audio after StartStream().  When a
+  // wedge is detected all streams across all dispatchers must be closed.  After
+  // all streams are closed, streams are restarted.  See http://crbug.com/160920
+  virtual void CloseStreamsForWedgeFix() = 0;
+  virtual void RestartStreamsForWedgeFix() = 0;
+
   // Accessor to the input device id used by unified IO.
   const std::string& input_device_id() const { return input_device_id_; }