@DonnaWuDongxia

I think I have figured out why instrumentation test fails. The issue is a bit tricky and easy to be ignored. It is caused by the `//` comments. Sorry for ignoring such an issue.

We can NOT use `//` to comment out code, instead, we MUST use `/*...*/` to comments. 

Since the `broadcast.html` is used as asset file, and its content will be read as a html text streaming which will be loaded by XWalk. If `//` is used, all the contents starts with `//` will be deemed as comments!

The test case can pass with changing `//` to `/*...*/`. Please have a try.