I was wondering if WebGL is considered stable enough to be enabled by default. It makes some PDFs render much faster and it has been off by default for a while now, so we have had quite some time to test it.

If we decide to enable WebGL by default, we should not forget to update https://github.com/mozilla/pdf.js/blob/master/extensions/chromium/preferences_schema.json#L39 as well.

/cc @yurydelendik 
/cc @Snuffleupagus (because IIRC you were testing WebGL too)

return this._transport.getMetadata();
  }
  /**
   * @typedef {Object} MarkInfo
   * Properties correspond to Table 321 of the PDF 32000-1:2008 spec.
   * @property {boolean} Marked
   * @property {boolean} UserProperties
   * @property {boolean} Suspects
   */
  /**
   * @returns {Promise<MarkInfo | null>} A promise that is resolved with
   *   a {MarkInfo} object that contains the MarkInfo flags for the PDF
   *   document, or `null` when no MarkInfo values are present in the PDF file.
   */
  getMarkInfo() {
    return this._transport.getMarkInfo();
  }
  /**
   * @returns {Promise<TypedArray>} A promise that is resolved with a
   *   {TypedArray} that has the raw data from the PDF.
   */
  getData() {