The annotation reference tests now show the date/time placeholder, but since localization is not active we don't see the actual date/time string. It would be nice to be able to have this in the reference images.
if (this.inFlightRequests > 0) {
      this.inflight.textContent = this.inFlightRequests;
      setTimeout(this._done.bind(this), WAITING_TIME);
    } else {
      setTimeout(this._quit.bind(this), WAITING_TIME);
    }
  }
  _sendResult(snapshot, task, failure) {
    const result = JSON.stringify({
      browser: this.browser,
      id: task.id,
      numPages: task.pdfDoc ? task.lastPage || task.pdfDoc.numPages : 0,
      lastPageNum: this._getLastPageNumber(task),
      failure,
      file: task.file,
      round: task.round,
      page: task.pageNum,
      snapshot,
      stats: task.stats.times,
      viewportWidth: task.viewportWidth,
      viewportHeight: task.viewportHeight,
      outputScale: task.outputScale,
    });
    return this._send("/submit_task_results", result);
  }
  _send(url, message) {