[misc][XWALK-1103] Add a usecase for callhistory

- Because IVI is not support this spec, change the status to designed.

Impacted TCs (designed): New 1, Update 0, Delete 0
Unit test Platform: [Tizen IVI]
Tizen IVI test result summary: Pass 0 Fail 1, Blocked 0
Merge pull request #314 from JianfengXu/xujf/misc/call

[misc][XWALK-1103] Add a usecase for callhistory
[webdriver] Update README
Merge pull request #316 from zqzhang/zqzhang/webdriver-readme

[webdriver] Update README