Player.PlayWhenReadyChangeReason (ExoPlayer library)

```
@Documented
@Retention(SOURCE)
@Target({FIELD,METHOD,PARAMETER,LOCAL_VARIABLE,TYPE_USE})
public static @interface Player.PlayWhenReadyChangeReason
```
Reasons for playWhenReady changes. One of Player.PLAY_WHEN_READY_CHANGE_REASON_USER_REQUEST, Player.PLAY_WHEN_READY_CHANGE_REASON_AUDIO_FOCUS_LOSS, Player.PLAY_WHEN_READY_CHANGE_REASON_AUDIO_BECOMING_NOISY, Player.PLAY_WHEN_READY_CHANGE_REASON_REMOTE or Player.PLAY_WHEN_READY_CHANGE_REASON_END_OF_MEDIA_ITEM.