[webapi] Integrate 75 tests for FileWriterAPI

- approved: 18, designed: 57

Impacted tests(approved): new 18, update 0, delete 0
Unit test platform: [IVI] crosswalk-10.38.222, t-e-c 0.107
Unit test result summary: pass 18, fail 0, block 0
[wrt] Move google play suite to crosswalk-test-suite/wrt/
[misc]rename the test suite name
[Detailed commit message (if have)]
Unit test platform: [Tizen]
Test Result: pack to wgt and run tcs pass 3, fail 1, block 0
Merge pull request #1168 from linshen/shenlin/update-testsuite-name

[misc]rename the test suite name
Merge pull request #1166 from xinliux/filewriterapi-integrate

[webapi] Integrate 75 tests for FileWriterAPI
Merge pull request #1167 from Honry/mv-google-play

[wrt] Move google play suite to crosswalk-test-suite/wrt/