function makeReference(uri, startTime, endTime) {
    return new shaka.media.SegmentReference(
        startTime,
        endTime,
        /* getUris= */ () => [uri],
        /* startByte= */ 0,
        /* endByte= */ null,
        /* initSegmentReference= */ null,
        /* timestampOffset= */ 0,
        /* appendWindowStart= */ 0,
        /* appendWindowEnd= */ Infinity,
        /* partialReferences= */ [],
        /* tilesLayout= */ undefined,
        /* tileDuration= */ undefined,
        /* syncTime= */ undefined,
        /* status= */ undefined,
        /* aesKey= */ null);
  }
Creates a real SegmentReference.

@param {string} uri
@param {number} startTime
@param {number} endTime
@return {shaka.media.SegmentReference}