[Gecko Bug 1785305] Set Resize Observer's last reported size to -1x-1 initially. #35745
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It used to be 0x0, but changed per the CSSWG resolution:
w3c/csswg-drafts#3664
Sits behind pref
dom.resize_observer.last_reported_size_invalid
.Differential Revision: https://phabricator.services.mozilla.com/D155710
bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1785305
gecko-commit: 14e81415cae10e0699145eb052b49d369f5ee427
gecko-reviewers: emilio