Add IPC interface for switching the audio output device for a given audio stream in the browser.

media/audio/audio_output_ipc.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_IPC_H_
 #define MEDIA_AUDIO_AUDIO_OUTPUT_IPC_H_
 
+#include <string>
+
 #include "base/memory/shared_memory.h"
 #include "base/sync_socket.h"
 #include "media/audio/audio_parameters.h"
 #include "media/base/media_export.h"
+#include "url/gurl.h"
 
 namespace media {
 
+// Result of an audio output device switch operation
+enum SwitchOutputDeviceResult {
+  SWITCH_OUTPUT_DEVICE_RESULT_SUCCESS = 0,
+  SWITCH_OUTPUT_DEVICE_RESULT_ERROR_NOT_FOUND,
+  SWITCH_OUTPUT_DEVICE_RESULT_ERROR_NOT_AUTHORIZED,
+  SWITCH_OUTPUT_DEVICE_RESULT_ERROR_OBSOLETE,
+  SWITCH_OUTPUT_DEVICE_RESULT_ERROR_NOT_SUPPORTED,
+  SWITCH_OUTPUT_DEVICE_RESULT_LAST =
+      SWITCH_OUTPUT_DEVICE_RESULT_ERROR_NOT_SUPPORTED,
+};
+
 // Contains IPC notifications for the state of the server side
 // (AudioOutputController) audio state changes and when an AudioOutputController
 // has been created.  Implemented by AudioOutputDevice.
 class MEDIA_EXPORT AudioOutputIPCDelegate {
  public:
   // Current status of the audio output stream in the browser process. Browser
   // sends information about the current playback state and error to the
   // renderer process using this type.
   enum State {
     kPlaying,
@@ skipping 57 matching lines @@
   // AudioOutputController in the peer process.
   virtual void CloseStream() = 0;
 
   // Sets the volume of the audio stream.
   virtual void SetVolume(double volume) = 0;
 };
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_AUDIO_OUTPUT_IPC_H_