[webapi] Integrate 6 tests for CSS3 Text

 - These tests come from http://svn.webkit.org/repository/webkit/trunk/LayoutTests/fast/text/

Impacted tests(approved): new 6, update 0, delete 0
Unit test platform: [Android]
Unit test result summary: pass 6, fail 0, block 0
[webapi] Add 7 cases for audio from w3c

- 2 tests come from https://github.com/w3c/web-platform-tests/tree/master/html/semantics/embedded-content/the-audio-element (commit 5caa5d10e06703a0175bfea7ada3afa392debacb)
- 5 tests come from https://github.com/w3c/web-platform-tests/tree/master/html/semantics/embedded-content/media-elements (commit 5caa5d10e06703a0175bfea7ada3afa392debacb)

Impacted tests(approved): new 7, update 0, delete 0
Unit test platform: [android] crosswalk-10.38.222
Unit test result summary: pass 7, fail 0, block 0
[webapi][XWALK-2974,2975] Fix entry issue for Web RTC
[wrt] Remove useless commend in tct-pm-wrt-tests/inst.wgt.py
[misc-abat] Rename web-abat-tests to web-abat-xwalk-tests
Merge pull request #1312 from Honry/rename-abat

[misc-abat] Rename web-abat-tests to web-abat-xwalk-tests
Merge pull request #1334 from kangxu/kangxu/webapi/webapi-webrtc-w3c-tests/fixIssue

[webapi][XWALK-2974,2975] Fix entry issue for Web RTC
Merge pull request #1327 from yunxiaoxie/move-up-text

[webapi] Integrate 6 tests for CSS3 Text
Merge pull request #1326 from xinliux/audio-upstream

[webapi] Add 7 cases for audio from w3c
Merge pull request #1335 from haoxli/wrt/pm-inst

[wrt] Remove useless commend in tct-pm-wrt-tests/inst.wgt.py