SDK / exoplayer

- When in STATE_SEEK with targetGranule==0, seeking would exit
  without checking that the input was positioned at the correct
  place.
- Seeking could fail due to trying to read beyond the end of the
  stream.
- Seeking was not robust against IO errors during the skip phase
  that occurs after the binary search has sufficiently converged.

PiperOrigin-RevId: 261317035