[webapi] Use pkgcmd to get pkgids for widget02

- Update pkgcmd to get pkgids, and need to update the awk rule
[webapi] Update 8 tests for Web Audio API

Impacted tests(approved): new 0, update 8, delete 0
Unit test platform: [Android]
Unit test result summary: pass 8, fail 0, block 0
Merge pull request #1064 from kangxu/kangxu/webapi/tct-webaudio-w3c-tests/updatCase

[webapi] Update 8 tests for Web Audio API
Merge pull request #1059 from xinliux/xinliux/webapi/widget-pkgids

[webapi] Use pkgcmd to get pkgids for widget02
[misc][XWALK-2578] Add app switching test to xwalk system

- Add test to verify programmatic switching of applications
Merge pull request #1041 from xinliux/xinliux/misc/add-wrapper

[misc][XWALK-2578] Add app swithing test to xwalk system