After this change users of ExoPlayerImpl and SimpleExoPlayer can use the media item base playlist API which converts the media item to a media source.
It adds the media item based methods to the ExoPlayer instead of the Player interface. This avoids a big change in the CastPlayer which requires migrating the cast extension to the MediaItem of the core module (follow up CLs).
PiperOrigin-RevId: 300575567
2028fdd756