restored functionality of XDK agents (AppPreview and AppPreviewXWalk) broken since xwalk9. The fix consist in checking of uid passed thorough AllowConnectionFromUid and only if uid is not eq to the stored, call chromium corresponded function to check
Merge pull request #2528 from elvin-nnov/master

restored functionality of XDK agents (AppPreview and AppPreviewXWalk)
[Tizen][Linux] Support the following URI schemes: tel://, sms://, mailto://.

Override content::RuntimeResourceDispatcherHostDelegate::HandleExternalProtocol
to implement the platform-specific surpporting:

1 On TizenIVI, through DBus to invoke corresponding default system application.
2 On Linux, use XDG utils.
3 On Android, it's been implemented already, keep unchanged.

BUG=https://crosswalk-project.org/jira/browse/XWALK-1501