ibaker b64bf88272 Rename playback thread in MediaSourceTestRunner
This makes it more clearly "the playback thread" when logging its name
during tests. The 'real' playback thread used in
`ExoPlayerImplInternal` is [called
`ExoPlayer:Playback`](49dec5db8b/libraries/exoplayer/src/main/java/androidx/media3/exoplayer/PlaybackLooperProvider.java (L87)).

PiperOrigin-RevId: 687307440
2024-10-18 08:14:08 -07:00
..

Test utils module

Provides utility classes for media unit and instrumentation tests.