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)

this.canvasGraphicsFactory = canvasGraphicsFactory;
    this.baseTransform = baseTransform;
    this.ctx = ctx;
  }
  TilingPattern.prototype = {
    createPatternCanvas: function TilinPattern_createPatternCanvas(owner) {
      const operatorList = this.operatorList;
      const bbox = this.bbox;
      const xstep = this.xstep;
      const ystep = this.ystep;
      const paintType = this.paintType;
      const tilingType = this.tilingType;
      const color = this.color;
      const canvasGraphicsFactory = this.canvasGraphicsFactory;
      info("TilingType: " + tilingType);