Link to PDF file (or attach file here):
[pages4.pdf](https://github.com/mozilla/pdf.js/files/1128300/pages4.pdf)

Configuration:
- Web browser and its version: Firefox 54
- Operating system and its version: Win 10
- PDF.js version: 1.8.522
- Is an extension: no

What is the expected behavior? (add screenshot)
![chrome1-1 1](https://user-images.githubusercontent.com/146436/27918380-2f74512a-6245-11e7-8525-d0038fa6c2e8.jpg)
![chrome1-2 1](https://user-images.githubusercontent.com/146436/27918425-54f8e47e-6245-11e7-9bff-127f79ad0511.jpg)


What went wrong? (add screenshot)
![screenshot from 2017-07-06 12-10-30](https://user-images.githubusercontent.com/146436/27918442-5d57624e-6245-11e7-9436-5ba31cc8bd1a.png)
![screenshot from 2017-07-06 12-10-44](https://user-images.githubusercontent.com/146436/27918454-63b486da-6245-11e7-9eb5-c03aa5c40943.png)



this.ctx.transform(a, b, c, d, e, f);
    this._cachedGetSinglePixelWidth = null;
  }
  
  constructPath(ops, args) {
    const ctx = this.ctx;
    const current = this.current;
    let x = current.x,
      y = current.y;
    for (let i = 0, j = 0, ii = ops.length; i < ii; i++) {
      switch (ops[i] | 0) {
        case OPS.rectangle:
          x = args[j++];
          y = args[j++];
          const width = args[j++];
          const height = args[j++];
          const xw = x + width;
          const yh = y + height;