[Android] Add test case for handling wtai uri

wtai is a standard w3c defined at http://www.w3.org/wiki/UriSchemes/wtai.

BUG=https://crosswalk-project.org/jira/browse/XWALK-321
[Android] Fix crash issue caused by the download listener.

This is because the XWalk core uses the request API to download
local file in the case, which would cause the crash.

So when downloading the local file, download listener would
only do the file transfer for this.

BUG=https://crosswalk-project.org/jira/browse/XWALK-338
Merge pull request #1160 from junmin-zhu/file

[Android] Fix crash issue caused by the download listener.
[WiDi API] Fix the issue for the relative url passed to requestShow.

If a relative url is passed to requestShow, the page can not be opened correctly.
Fix it by resolving the url with base url to make it to be an absolute one.
Merge pull request #1174 from wang16/wtai_test

[Android] Add test case for handling wtai uri
Merge pull request #1163 from kurli/resolve-relative-url

[WiDi API] Fix the issue for the relative url passed to requestShow.
[Tizen][UI] Move TizenSystemIndicator to tizen/mobile/ui/

Move system indicator view and its helpers to tizen/mobile/ui/. The
rationale is that tizen/mobile/ directory stores components that are
self-contained and Tizen mobile specific.