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0dd43b0183
EPII currently uses 'synchronized' for two purposes:
1. `waitUninteruptably` to ensure the condition checks and
`wait` calls are atomic + the calls on the playback thread
that update these conditions to `notifyAll`.
2. Access to the `released` field that is used a condition
for `waitUninterruptibly` but otherwise only accessed on the
app thread.
We can remove the second usage by making the `released` variable
more clearly single thread on the app thread (including renaming to
make it obvious as this is the only variable in this class accessed
on that thread). The `waitUninterruptly` call for `release` can use
an `AtomicBoolean` like the other two calls to this method.
This also fixes a potential bug where a release timeout would leave
the `released` field as `false`, meaning future calls to these other
methods wouldn't be blocked early.
PiperOrigin-RevId: 743156035