appendDependency(data, timestampOffset, stream) {
    if (this.lcevcDec_) {
      // Append buffers to the LCEVC Dec for parsing and storing
      // of LCEVC data.
      this.lcevcDec_.appendBuffer(data, timestampOffset, stream);
    }
  }
Append dependency data.
@param {BufferSource} data
@param {number} timestampOffset
@param {shaka.extern.Stream} stream