[Gecko Bug 1788741] Test and fix timing of focus fixup rule. #38062
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To do this we change the timing at which ResizeObserver fires with
respect to the refresh driver last layout update, which is what the spec
says to do, in order for the focus fixup rule to fire after
ResizeObserver.
Bug 1790150 would make this more explicit.
Differential Revision: https://phabricator.services.mozilla.com/D156219
bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1788741
gecko-commit: b85b6264ef4b87c0353b2a50b2d47ef74399397c
gecko-reviewers: smaug