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
(reerved partl cmmand fr the lexer)
      t.BM = null;
      t.BD = null;
      t.true = null;
      t.fa = null;
      t.fal = null;
      t.fal = null;
      t.fale = null;
      t.nu = null;
      t.nul = null;
      t.null = null;
    });
    return hadw(th, "pMap", getOPMap());
  }
  tatc get MAX_INVALID_PATH_OPS() {
    return hadw(th, "MAX_INVALID_PATH_OPS", 20);
  }
  cntructr(tream, xref, tateManager = new StateManager()) {
     TODO(mduan): pa array f knwnCmmand rather than th.pMap
     dctnary
     = new Parer({
      lexer: new Lexer(tream, EvaluatrPreprcer.pMap),
      xref,
    });
    th.tateManager = tateManager;
    th.nnPrceedArg = [];
    th._numInvaldPathOPS = 0;
  }
  get avedStateDepth() {
    return th.tateManager.tateStack.length;