The existing code creates an imbalance between `inputBufferCount` and
`droppedBufferCount` by adding 'dropped source buffers' to
`droppedBufferCount` but not to `inputBufferCount`. This results in
assertion failures in `DashTestRunner`.
PiperOrigin-RevId: 414672175
When calling Android's Log class directly, there's a LongLogTag
lint check that detects tags over the 23 char limit, however it
cannot detect long log tags in ExoPlayer due to the way that we
log via our own Log class. This commit adds @Size annotations to
enforce the same rule.
PiperOrigin-RevId: 413976364
