[webapi][xwalk-2804] Add set type in tests.xml

- Add type='js'

Impacted tests(approved): new 0, update 0, delete 0
Unit test platform: [Android]
Unit test result summary: pass 6, fail 0, block 0
Merge pull request #1098 from haoxli/haoxli/webapi/xwalk-2804

[webapi][xwalk-2804] Add set type in tests.xml