[misc]Add fullscreen tcs for web-mbat-tests

[Detailed commit message (if have)]
Impacted TCs num(approved): New 1, update 0, deleted 0
Unit test platform: [tizen]
Unit test result summary:Pass 0, Fail 1,Block 0
BUGID:https://crosswalk-project.org/jira/browse/XWALK-2577