2028fdd756
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