Bug 1680769 - Fix the texture cache allocating rectangles multiple times (again). r=jnicol
Bug 1680769 - Fix the texture cache allocating rectangles multiple times (again). r=jnicol

Differential Revision: https://phabricator.services.mozilla.com/D98941

[ghsync] From https://hg.mozilla.org/mozilla-central/rev/f1ad5c9b8c33a2acd52ca2ac6183d53b84bbeeb0

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