getTimelineForTime(time) {
    for (const index of this.indexes_) {
      const position = index.find(time);

      if (position != null) {
        return index.continuityTimeline();
      }
    }

    return -1;
  }
Return a list of the continuity timelines for each of the segment indexes
of this meta segment index, assuming the child segment index is a timeline
segment index.
@return {number}