[webapi][XWALK-2313] Adding set landscape-primary orientation atfer 100s  for screenorientation

- When lock orientation to "portrait-primary", if can't fire event, after 100 ms, lock orientation to "landscape-primary"
- Failure reason: We test on IVI, onorientationchange event can't invoked.

Impacted TCs num(approved): New 0, Update 1, Delete 0
Unit test Platform: Tizen IVI
Tizen test result summary: Pass 0, Fail 1, Blocked 0
Merge pull request #735 from xinliux/xinliux/webapi/XWALK-2313

[webapi][XWALK-2313]  Adding set landscape-primary orientation after 100ms for screenorientation