[usecase-wrt][XWALK-1163/1491/1171] Add tcs for usecase

[Detailed commit message (if have)]
Impacted TCs num(approved): New 1, update 1, deleted 0
Impacted TCs num(designed): New 2, update 0, deleted 0
Unit test platform: [tizen]
Unit test result summary: Pass 2, Fail 0, Blocked 0
Merge pull request #830 from linshen/wrt/shen/add-usecase-feature

[usecase-wrt][XWALK-1163/1491/1171] Add tcs for usecase