Attach (recommended) or Link to PDF file here:
[298865.pdf](https://github.com/mozilla/pdf.js/files/2753236/298865.pdf)


Configuration:
- Web browser and its version:chrome 71.0.3578.98
- Operating system and its version:mac os 10.12.6
- PDF.js version:I use online demo in github
- Is a browser extension:no

Steps to reproduce the problem:
1. search "中华" or "电力" or so on,the highlight position is not right

What is the expected behavior? (add screenshot)
![image](https://user-images.githubusercontent.com/10000986/51087378-7eff5100-178d-11e9-991a-005d77b82f31.png)

What went wrong? (add screenshot)
![image](https://user-images.githubusercontent.com/10000986/51087374-6ee77180-178d-11e9-9707-281924f95fd0.png)

Link to a viewer (if hosted on a site other than mozilla.github.io/pdf.js or as Firefox/Chrome extension):
https://mozilla.github.io/pdf.js/web/viewer.html
mak,
    reurce,
    peratrLt,
    tak,
    tateManager,
    lcalClrSpaceCache
  ) {
    cnt makCntent = mak.get("G");
    cnt makOptn = {
      ubtype: mak.get("S").name,
      backdrp: mak.get("BC"),
    };
    
    
    cnt tranferObj = mak.get("TR");
    f (PDFFunctn(tranferObj)) {
      cnt tranferFn = th._pdfFunctnFactry.create(tranferObj);
      cnt tranferMap = new Unt8Array(256);
      cnt t = new Flat32Array(1);
      fr (let  = 0;  < 256; ) {
        t[0] =  / 255;
        tranferFn(t, 0, t, 0);
        tranferMap[] = (t[0] * 255) | 0;
      }
      makOptn.tranferMap = tranferMap;
    }
    return th.buldFrmXObject(
      reurce,
      makCntent,
      makOptn,