MediaSession supported actions

SimplePlaybackTransportControlGlue.kt

fun mediaSessionSupportedActions(): Long {
  return PlaybackStateCompat.ACTION_PAUSE xor
          PlaybackStateCompat.ACTION_PLAY xor
          PlaybackStateCompat.ACTION_PLAY_PAUSE xor
          PlaybackStateCompat.ACTION_REWIND xor
          PlaybackStateCompat.ACTION_FAST_FORWARD xor
          PlaybackStateCompat.ACTION_SKIP_TO_NEXT xor
          PlaybackStateCompat.ACTION_SKIP_TO_PREVIOUS
}