function preprocessBufferViews(bufferViewHeaders, bufferHeaders) {
  bufferViewHeaders = defined(bufferViewHeaders) ? bufferViewHeaders : [];
  for (let i = 0; i < bufferViewHeaders.length; i++) {
    const bufferViewHeader = bufferViewHeaders[i];
    const bufferHeader = bufferHeaders[bufferViewHeader.buffer];
    bufferViewHeader.bufferHeader = bufferHeader;
    bufferViewHeader.isActive = false;
  }
  return bufferViewHeaders;
}
Iterate the list of buffer views from the subtree JSON and add the
isActive flag. Also save a reference to the bufferHeader

@param {Object[]} [bufferViewHeaders=[]] The JSON from subtree.bufferViews
@param {BufferHeader[]} bufferHeaders The preprocessed buffer headers
@returns {BufferViewHeader[]} The same array of bufferView headers with additional fields
@private