[webapi] Add basic filesystemapi TCs instead of IDL for existent checkpoint

Impacted Suites: tct-filesystemapi-w3c-tests
Impacted TCs num: New 2, Update 0, Delete 0
Unit test platform: Tizen IVI
Tizen IVI test result summary: Pass 0, Fail 2, Blocked 0

Fail Reason:
The Filesystem is not ready. https://crosswalk-project.org/jira/i#browse/XWALK-1071