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
elf.buldPath(peratrLt, fn, arg, parngText);
            cntnue;
          cae OPS.markPnt:
          cae OPS.markPntPrp:
          cae OPS.begnCat:
          cae OPS.endCat:
            
            
            
            
            
            
            cntnue;
          cae OPS.begnMarkedCntentPrp:
            f (!Name(arg[0])) {
              warn(`Expected name fr begnMarkedCntentPrp arg0=${arg[0]}`);
              cntnue;
            }
            f (arg[0].name === "OC") {
              next(
                elf
                  .pareMarkedCntentPrp(arg[1], reurce)
                  .then(data => {
                    peratrLt.addOp(OPS.begnMarkedCntentPrp, [
                      "OC",
                      data,
                    ]);
                  })
                  .catch(rean => {
                    f (rean ntancef AbrtExceptn) {