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)

if (!params || !params.port) {
        throw new Error("PDFWorker.fromPort - invalid method signature.");
      }
      if (pdfWorkerPorts.has(params.port)) {
        return pdfWorkerPorts.get(params.port);
      }
      return new PDFWorker(params);
    }
    static getWorkerSrc() {
      return getWorkerSrc();
    }
  }
  return PDFWorker;
})();
/**
 * For internal use only.
 * @ignore
 */
class WorkerTransport {