[usecase] Update TC name

Impacted TCs num(designed): New 0, Update 1, Delete 0
[usecase-webapi][XWALK-2353] Update the url path for mediarenderer

- Update the url path to absolute path
- Failure analysis: The prefetchURI method and mute method cannot work

Impacted tests(approved): new 0, update 1, delete 0
Unit test platform: [Tizen IVI]
Unit test result summary: pass 0, fail 1, block 0
[usecase-wrt]update test step for AudioPolicy

[Detailed commit message (if have)]
Impacted TCs num(approved): New 0, update 1, deleted 0
Unit test platform: [tizen]
Unit test result summary:Pass 0, Fail 1,Block 0
BUGID:https://crosswalk-project.org/jira/browse/XWALK-2562
Merge pull request #913 from wanghongjuan/wanghongjuan/usecase/1947

[usecase] Update TC name
Merge pull request #916 from linshen/shenlin/wert/updatepaused

[usecase-wrt]update test step for AudioPolicy
Merge pull request #914 from yunxliu/yunxliu/misc/mediarenderer

[usecase-webapi][XWALK-2353] Update the url path for mediarenderer
Update index.html
[misc-wrt] Update test steps of googleplay tests

 Impacted TCs num(approved): new 0, update 5, delete 0
 Unit test platform: [Android]
 Unit test result summary: Pass 5, Fail 0, Block 0
Merge pull request #885 from Honry/Honry/update-google-play-steps

[misc-wrt] Update test steps of googleplay tests
[usecase][xwalk-2391] Update test code

Impacted TCs num(approved): New 0, Update 7, Delete 0
Unit test Platform: Android
Android test result summary: Pass 7, Fail 0, Block 0
Merge pull request #918 from wanghongjuan/wanghongjuan/usecase/2391

[usecase][xwalk-2391] Update test code