[webapi] Import tests for Screen Orientation from blink

-Rewrite Blink screenorientation tests using testharness.js

Impacted TCs num(approved): New 3, Update 0, Delete 0
Unit test Platform: Tizen M0
Tizen test result summary: Pass 3, Fail 0, Blocked 0
Merge pull request #339 from xinliux/xinliux/webapi/screenorientation-blink

[webapi] Import tests for Screen Orientation from Blink