Tab Audio Capture: Browser-side connect/disconnect functionality.

media/audio/audio_output_controller.h

Index: media/audio/audio_output_controller.h
diff --git a/media/audio/audio_output_controller.h b/media/audio/audio_output_controller.h
index 3dae719856508cd6a25e28dc22cd84305a35dd58..73fb014ecc09d700a8dbd94b4a241adb16533480 100644
--- a/media/audio/audio_output_controller.h
+++ b/media/audio/audio_output_controller.h
@@ -158,6 +158,21 @@ class MEDIA_EXPORT AudioOutputController
   // to being called.
   virtual void OnDeviceChange() OVERRIDE;
 
+  // Accessor to audio output parameters.
+  const AudioParameters& params() const { return params_; }
+
+  // Stops the normal audio output stream and creates an AudioSourceCallback to
+  // provide audio data to some other destination.  The given object will always
+  // return data when OnMoreData() is invoked, even if the underlying
+  // implementation is paused/stopped.  AudioOutputController retains ownership
+  // of the returned object.
+  AudioOutputStream::AudioSourceCallback* Divert();
+
+  // Restores normal audio output behavior for the current playback state.
+  // |asc| is the pointer returned by the previous call to Divert() and becomes
+  // invalid once this method is called.
+  void Revert(AudioOutputStream::AudioSourceCallback* asc);
+
  protected:
     // Internal state of the source.
   enum State {
@@ -228,7 +243,7 @@ class MEDIA_EXPORT AudioOutputController
   // Number of times left.
   int number_polling_attempts_left_;
 
-  AudioParameters params_;
+  const AudioParameters params_;
 
   // Used to post delayed tasks to ourselves that we can cancel.
   // We don't want the tasks to hold onto a reference as it will slow down