[xwalk-2722] Fix fullscreen scroll up/down

- Fix fullscreen block screen scroll up/down after return normal
- Fix similar name test will be marked as same result

Impacted tests(approved): new 0, update 1, delete 0
Unit test platform: [Android]
Unit test result summary: pass 1, fail 0, block 0
Merge pull request #21 from haoxli/haoxli/bug/xwalk-2722

[xwalk-2722] Fix fullscreen scroll up/down