Link to PDF file (or attach file here):
https://issues.apache.org/jira/secure/attachment/12650283/000004_ShadingPatternTextPDF.pdf

Configuration:
- Web browser and its version: FF 51.0.1 32bit
- Operating system and its version: W7
- PDF.js version: latest

Steps to reproduce the problem:
display file

What is the expected behavior? (add screenshot)
![ok](https://cloud.githubusercontent.com/assets/6665575/23339534/5ff2de9c-fc25-11e6-837e-0fdaf81b4ca9.png)

What went wrong? (add screenshot)
![nok](https://cloud.githubusercontent.com/assets/6665575/23339536/63f7a37e-fc25-11e6-813c-cc218cc4def3.png)

possibly similar problem:
https://www.pdflib.com/fileadmin/pdflib/Cookbook/pdf/color_gradient.pdf (shaded text completely missing)
https://issues.apache.org/jira/secure/attachment/12630566/pslib-shading.pdf (page 4, part of text missing)
https://issues.apache.org/jira/secure/attachment/12652009/pattern-shading-2-4-idMatrix.pdf (some text missing)
https://issues.apache.org/jira/secure/attachment/12652010/pattern-shading-2-4-noMatrix.pdf (some text missing)

matrix = Util.transform(matrix, owner.baseTransform);
      if (this.matrix) {
        matrix = Util.transform(matrix, this.matrix);
      }
    }
    const temporaryPatternCanvas = this.createPatternCanvas(owner);
    let domMatrix = new DOMMatrix(matrix);
    
    
    domMatrix = domMatrix.translate(
      temporaryPatternCanvas.offsetX,
      temporaryPatternCanvas.offsetY
    );
    domMatrix = domMatrix.scale(
      1 / temporaryPatternCanvas.scaleX,
      1 / temporaryPatternCanvas.scaleY
    );
    const pattern = ctx.createPattern(temporaryPatternCanvas.canvas, "repeat");
    try {
      pattern.setTransform(domMatrix);
    } catch (ex) {
      
      
      warn(`TilingPattern.getPattern: "${ex?.message}".`);
    }
    return pattern;
  }
}
export { getShadingPattern, TilingPattern };