function PDFPageProxy(pageInfo, transport) {
    this.pageInfo = pageInfo;
    this.transport = transport;
    this.stats = new StatTimer();
    this.stats.enabled = !!globalScope.PDFJS.enableStats;
    this.objs = transport.objs;
    this.renderInProgress = false;
  }
@return {Promise} A promise that is resolved with an {object} that has
info and metadata properties.  Info is an {object} filled with anything
available in the information dictionary and similarly metadata is a
{Metadata} object with information from the metadata section of the PDF.