Add support for the audio-output-device switching IPC mechanism to the renderer lower layers (media…

media/audio/audio_output_ipc.h

Index: media/audio/audio_output_ipc.h
diff --git a/media/audio/audio_output_ipc.h b/media/audio/audio_output_ipc.h
index 9af1df44efe8aa76992a7063b2422aff83328ddf..a224c733ebaed3e3abaddca21e684456b8e28142 100644
--- a/media/audio/audio_output_ipc.h
+++ b/media/audio/audio_output_ipc.h
@@ -7,6 +7,7 @@
 
 #include <string>
 
+#include "base/callback.h"
 #include "base/memory/shared_memory.h"
 #include "base/sync_socket.h"
 #include "media/audio/audio_parameters.h"
@@ -26,6 +27,8 @@ enum SwitchOutputDeviceResult {
       SWITCH_OUTPUT_DEVICE_RESULT_ERROR_NOT_SUPPORTED,
 };
 
+typedef base::Callback<void(SwitchOutputDeviceResult)> SwitchOutputDeviceCB;
+
 // 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.
@@ -57,6 +60,10 @@ class MEDIA_EXPORT AudioOutputIPCDelegate {
                                base::SyncSocket::Handle socket_handle,
                                int length) = 0;
 
+  // Called when an attempt to switch the output device has been completed
+  virtual void OnOutputDeviceSwitched(int request_id,
+                                      SwitchOutputDeviceResult result) = 0;
+
   // Called when the AudioOutputIPC object is going away and/or when the IPC
   // channel has been closed and no more ipc requests can be made.
   // Implementations should delete their owned AudioOutputIPC instance
@@ -99,6 +106,11 @@ class MEDIA_EXPORT AudioOutputIPC {
 
   // Sets the volume of the audio stream.
   virtual void SetVolume(double volume) = 0;
+
+  // Switches the output device of the audio stream.
+  virtual void SwitchOutputDevice(const std::string& device_id,
+                                  const GURL& security_origin,
+                                  int request_id) = 0;
 };
 
 }  // namespace media