Comment 2 for bug 1435850

So, this is basically carry over from QtWebkit. It makes sense and I would like to eventually have default implementations of the UI components provided by UbuntuWebView in Oxide (having an auxiliary UI provider for Ubuntu.Components with the possibility of adding one for QtQuick.controls too. Having a soft-dependency on either of those isn't a problem).

If we do this, it would make sense to provide additional mechanisms for applications to intercept things like JS alerts and HTTP auth requests so it can handle them without displaying the default UI