Bug 1606827 - A corner is not rounded when the radius is zero in either dimension (not necessarily both) r=nical
Bug 1606827 - A corner is not rounded when the radius is zero in either dimension (not necessarily both) r=nical

Differential Revision: https://phabricator.services.mozilla.com/D58615

[wrupdater] From https://hg.mozilla.org/mozilla-central/rev/5105e62fbbe6cb144a7a7a756128da326d724004

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