Bug 1570081 - Wrench rawtest changes. r=jrmuizel
Bug 1570081 - Wrench rawtest changes. r=jrmuizel

Differential Revision: https://phabricator.services.mozilla.com/D41387

[wrupdater] From https://hg.mozilla.org/mozilla-central/rev/775c0840f9cb1d8ccaa795aaf6d9c917a96115ce

servo/webrender,servo/webrender,servo/webrender,servo/webrender,servo/webrender,servo/webrender