[usecase-webapi] Improve NBS usecase.

- Fix the bug that nothing happen after click "Request" button.
- Draw a message frame to show NBS messages above the buttons.

Impacted tests(approved): New 0, Update 1, Delete 0
Unit test platform: [Tizen IVI]
Unit test result summary: Pass 1, Fail 0, Block 0
[wrt] Update tcs and script for wrt-packertool-android-tests

Impacted tests(approved): new 88, update 174, delete 0
Unit test platform: [Android]
Unit test result summary: pass 262, fail 0, block 0
[usecase-system][XWALK-1473] Add a TC for WebRTC

- Add a TC for WebRTC
- Failure analysis: The first channel onDataChannel can not be fired and the data channel name cannot be with space inside

Impacted tests(approved): new 0, update 1, delete 0
Unit test platform: [Android]
Unit test result summary: pass 0, fail 1, block 0
Merge pull request #716 from kangxu/kangxu/wrt/wrt-packertool-android-tests/addTcs

[wrt] Update tcs and script for wrt-packertool-android-tests
Merge pull request #516 from minxhuang/hm/misc/usecase-tizen/NBS-hotfix

[usecase-webapi] Improve NBS usecase.
Merge pull request #730 from yunxliu/yunxliu/misc/webrtc_google

[usecase-system][XWALK-1473] Add a TC for WebRTC