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)

* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * @module pdfjsLib
 */
import {
  AbortException,
  assert,
  createPromiseCapability,
  getVerbosityLevel,
  info,
  InvalidPDFException,
  isArrayBuffer,
  isSameOrigin,
  MissingPDFException,
  PasswordException,
  setVerbosityLevel,
  shadow,
  stringToBytes,
  UnexpectedResponseException,
  UnknownErrorException,
  unreachable,
  warn,
} from "../shared/util.js";
import {
  deprecated,
  DOMCanvasFactory,
  DOMCMapReaderFactory,