readBytes(bytes) {
    goog.asserts.assert(bytes >= 0, 'Bad call to DataViewReader.readBytes');
    if (this.position_ + bytes > this.dataView_.byteLength) {
      throw this.outOfBounds_();
    }

    const value =
        shaka.util.BufferUtils.toUint8(this.dataView_, this.position_, bytes);
    this.position_ += bytes;
    return value;
  }
Reads the specified number of raw bytes.
@param {number} bytes The number of bytes to read.
@return {!Uint8Array}
@export