[Gecko Bug 1610815] Fix a race condition in viewport-units-keyframes.html where an animation inside an iframe gets started before the iframe gets sized. #33599
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Depends on D143253
Differential Revision: https://phabricator.services.mozilla.com/D143259
bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1610815
gecko-commit: 32d002922d494bd7afaa77a62cecb36e1509f19e
gecko-reviewers: emilio