Bug 1706801 - Invalidate dirty rect state when an external compositor surface is removed r=gfx-reviewers,lsalzman
Bug 1706801 - Invalidate dirty rect state when an external compositor surface is removed r=gfx-reviewers,lsalzman

Differential Revision: https://phabricator.services.mozilla.com/D113041

[ghsync] From https://hg.mozilla.org/mozilla-central/rev/314f85af022f974b0ef3c17e8932f16b021d761d

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