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 renderContext = {
      canvasContext: ctx,
      transform,
      viewport: this.viewport,
      enableWebGL: this.enableWebGL,
      renderInteractiveForms: this.renderInteractiveForms,
      optionalContentConfigPromise: this._optionalContentConfigPromise,
    };
    const renderTask = this.pdfPage.render(renderContext);
    renderTask.onContinue = function (cont) {
      showCanvas();
      if (result.onRenderContinue) {
        result.onRenderContinue(cont);
      } else {
        cont();
      }
    };
    renderTask.promise.then(
      function () {
        showCanvas();
        renderCapability.resolve(undefined);
      },
      function (error) {
        showCanvas();
        renderCapability.reject(error);
      }
    );
    return result;
  }
  paintOnSvg(wrapper) {