bachinger c5e1169666 make media source factories reusable
First cl towards DefaultMediaSourceFactory (<unknown commit>) does not change the MediaSourceFactory interface except adding @Nullable anotations to setters.

PiperOrigin-RevId: 290269640
2020-01-17 16:12:41 +00:00
..
2020-01-17 16:12:41 +00:00
2019-12-18 18:54:44 +00:00