This will return the NSWindow* for the given QWindow*. Port the QWidget
autotest helper to use the native interface and the "nswindow" resource.
Change-Id: I754b7e9288690ac3c99c3ec65c5526d5fe121234
Reviewed-by: João Abecasis <joao.abecasis@nokia.com>
Reviewed-by: Morten Johan Sørvig <morten.sorvig@nokia.com>