*** Original commit ***
Rollback of https://github.com/google/ExoPlayer/commit/949bbcfb2e98c5cb76ebb35d68fc9f0da4706f16
*** Original commit ***
Add masking for playWhenReady.
Masking is needed as soon as updates to a value can happen both in EPI
and EPII. PlayWhenReady is currently not masked because all updates
happen in EPI only. As soon as we allow pausing at certain times
(e.g. end of a stream), playWhenReady c...
***
PiperOrigin-RevId: 300330307
