[wrt][XWALK-1668] Add 4 tcs for wrt-integration-tizen-tests

Impacted TCs num(approved): New 0, update 0, deleted 0
Impacted TCs num(designed): New 4, update 0, deleted 0
Unit test platform: [tizen]
Merge pull request #299 from linshen/add-xwalk-1668

[wrt][XWALK-1668] Add 4 tcs for wrt-integration-tizen-tests