Just runs a greasemonkey script on a test page and uses console.log to
ensure it is running.
Tests @include, and basic happy path greasemonkey.py operation (loading
and parsing script, scrip_for on webkit), only testing document-start
injecting point but that is the troublsome one at this point.
Tested on py35 debian unstable (oldwebkit and qtwebengine5.9) debian
stable qtwebengine5.7.
Note the extra :reload call for qt5.7 because document-start scripts
don't seem to run on the first page load with the current insertion
point. I need to look into this more to look at ways of fixing this.
When we open a background tab, it gets a hardcoded size (800x600 or so) because
it doesn't get resized by the layout yet.
By resizing it to the size it'll actually have later, we make sure scrolling to
an anchor in an background tab works, and JS also gets the correct size for
background tabs.
Fixes#1190Fixes#2495
See #1417
