Passing EXT-X-KEY DrmInitData through the FragmentedMp4Extractor
doesn't work for streams with key rotation, because an extractor
instance is used for multiple segments, but is only passed the
EXT-X-KEY DrmInitData corresponding to the first segment.
This change removes passing DrmInitData through the extractor,
and instead passes it via FormatAdjustingSampleQueue. This is
in-line with how manifest DrmInitData is handled during DASH
playbacks.
Issue: #6903
PiperOrigin-RevId: 292323429
This seeker is only seeking to frames that have already been read by the
extractor for playback. Seeking to not-yet-read frames will be
implemented in another change.
Issue: #6787
PiperOrigin-RevId: 291888899
