Link to PDF file (or attach file here):
[RP_25884_V2_UEL Semi Finals 2016-17_concepts.pdf](https://github.com/mozilla/pdf.js/files/994423/RP_25884_V2_UEL.Semi.Finals.2016-17_concepts.pdf)

Configuration:
- Web browser and its version: Chrome 58, Firefox 53
- Operating system and its version: MacOS 10.11.6
- PDF.js version:
- Is an extension: No

Steps to reproduce the problem:
1.  View the file the file


What is the expected behavior? (add screenshot)
<img width="560" alt="screen shot 2017-05-11 at 2 06 36 pm" src="https://cloud.githubusercontent.com/assets/2474027/25971992/189f4ebe-3653-11e7-8847-c9011984cb8d.png">

What went wrong? (add screenshot)
Textlayer exists here but font fails to render. No warning in the console from what I can see. Maybe related to the gradient?

<img width="637" alt="screen shot 2017-05-11 at 2 06 20 pm" src="https://cloud.githubusercontent.com/assets/2474027/25971997/1b518cc6-3653-11e7-96c0-9a03ffcb7d6e.png">

Thanks!
entry.x,
        entry.y,
        entry.w,
        entry.h,
        0,
        -1,
        1,
        1
      );
      if (this.imageLayer) {
        const position = this.getCanvasPosition(entry.x, entry.y);
        this.imageLayer.appendImage({
          imgData,
          left: position[0],
          top: position[1],
          width: w,
          height: h,
        });
      }
      ctx.restore();
    }
  }
  paintSolidColorImageMask() {
    if (!this.contentVisible) {
      return;
    }
    this.ctx.fillRect(0, 0, 1, 1);
  }
  
  markPoint(tag) {