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)

} else {
        for (const depObjId of argsArray[i]) {
          const objsPool = depObjId.startsWith("g_") ? commonObjs : objs;
          
          
          if (!objsPool.has(depObjId)) {
            objsPool.get(depObjId, continueCallback);
            return i;
          }
        }
      }
      i++;
      
      if (i === argsArrayLen) {
        return i;
      }
      
      
      if (chunkOperations && ++steps > EXECUTION_STEPS) {
        if (Date.now() > endTime) {
          continueCallback();
          return i;
        }
        steps = 0;
      }
      
      
    }
  }
  endDrawing() {