applyVideoTimestampOffsetRecursive_(cue, videoTimestampOffset) {
    cue.startTime += videoTimestampOffset;
    cue.endTime += videoTimestampOffset;
    for (const nested of cue.nestedCues) {
      this.applyVideoTimestampOffsetRecursive_(nested, videoTimestampOffset);
    }
  }
@param {!shaka.text.Cue} cue the cue to apply the timestamp to recursively
@param {number} videoTimestampOffset the timestamp offset of the video
@private