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)

const pageView = this._pages[i];
      pageView.update(pageView.scale, rotation);
    }
    
    
    if (this._currentScaleValue) {
      this._setScale(this._currentScaleValue, true);
    }
    this.eventBus.dispatch("rotationchanging", {
      source: this,
      pagesRotation: rotation,
      pageNumber,
    });
    if (this.defaultRenderingQueue) {
      this.update();
    }
  }
  get firstPagePromise() {
    return this.pdfDocument ? this._firstPageCapability.promise : null;
  }
  get onePageRendered() {
    return this.pdfDocument ? this._onePageRenderedCapability.promise : null;
  }
  get pagesPromise() {
    return this.pdfDocument ? this._pagesCapability.promise : null;
  }
  /**
   * @private
   */
  get _viewerElement() {