[pattern.pdf](https://github.com/mozilla/pdf.js/files/4022310/pattern.pdf)

Configuration:
- Firefox Nightly 73.0a1 (2020-01-04)
- macOS Mojave 10.14.6
- PDF.js version: 2.4.254
- Is a browser extension: built-in

Steps to reproduce the problem:
1. Open the PDF, zoom in to 200% for a more detailed view

What is the expected behavior?
<img width="736" alt="pattern-acrobat" src="https://user-images.githubusercontent.com/9106997/71770714-34dc2600-2f30-11ea-958d-4fea6f2b53c2.png">

What went wrong?
<img width="563" alt="pattern-pdfjs" src="https://user-images.githubusercontent.com/9106997/71770723-4a515000-2f30-11ea-8a92-cef4cac2a8f8.png">

The crosshatch pattern is rendered by pdf.js using the wrong pattern style. The other pattern style just seem to have a broken redering.

TeX source of PDF:
```tex
\documentclass[a4paper,11pt]{scrartcl}
\usepackage{tikz}
\usetikzlibrary{patterns}

\begin{document}
crosshatch pattern:
\begin{tikzpicture}
\draw[draw=black, fill=black!10, pattern=crosshatch, pattern color=black] (0,0) rectangle (1,1);
\end{tikzpicture}
\\

north east lines pattern:
\begin{tikzpicture}
\draw[draw=black, fill=black!10, pattern=north east lines, pattern color=black] (0,0) rectangle (1,1);
\end{tikzpicture}
\\

north west lines pattern:
\begin{tikzpicture}
\draw[draw=black, fill=black!10, pattern=north west lines, pattern color=black] (0,0) rectangle (1,1);
\end{tikzpicture}
\\

grid pattern:
\begin{tikzpicture}
\draw[draw=black, fill=black!10, pattern=grid, pattern color=black] (0,0) rectangle (1,1);
\end{tikzpicture}
\end{document}
```
this.ctx.canvas.width,
      combinedScale[0]
    );
    const dimy = this.getSizeAndScale(
      ystep,
      this.ctx.canvas.height,
      combinedScale[1]
    );
    const tmpCanvas = owner.cachedCanvases.getCanvas(
      "pattern",
      dimx.size,
      dimy.size,
      true
    );
    const tmpCtx = tmpCanvas.context;
    const graphics = canvasGraphicsFactory.createCanvasGraphics(tmpCtx);
    graphics.groupLevel = owner.groupLevel;
    this.setFillAndStrokeStyleToContext(graphics, paintType, color);
    graphics.transform(dimx.scale, 0, 0, dimy.scale, 0, 0);
    this.clipBbox(graphics, bbox, x0, y0, x1, y1);
    graphics.baseTransform = graphics.ctx.mozCurrentTransform.slice();
    graphics.executeOperatorList(operatorList);
    graphics.endDrawing();
    return {
      canvas: tmpCanvas.canvas,
      scaleX: dimx.scale,
      scaleY: dimy.scale,
    };
  }
  getSizeAndScale(step, realOutputSize, scale) {