b/15729204 Pipe sessions through to VolumePanel

When remote volume is changed via volume buttons we need to notify
the system UI so it can show the slider. This also passes it the
controller to use so adjustments to the slider are sent back to
the correct session.

Change-Id: If5847bcd5db16c56e0e9904b88c94e5b28954c41
diff --git a/Android.mk b/Android.mk
index d4bb04a..d504481 100644
--- a/Android.mk
+++ b/Android.mk
@@ -306,6 +306,7 @@
 	media/java/android/media/IRemoteControlDisplay.aidl \
 	media/java/android/media/IRemoteDisplayCallback.aidl \
 	media/java/android/media/IRemoteDisplayProvider.aidl \
+	media/java/android/media/IRemoteVolumeController.aidl \
 	media/java/android/media/IRemoteVolumeObserver.aidl \
 	media/java/android/media/IRingtonePlayer.aidl \
 	media/java/android/media/IVolumeController.aidl \