Should scroll anchoring apply to window resize / rotate? #11

@dbaron (and I believe others in the CSS WG discussion) mentioned that they would want scroll anchoring to apply in the window resize case.

I was thinking we had some other solution for that in Chrome (eg. doing a hit-test at the start of resize, like our rotation anchor stuff) but trying it on a couple sites on desktop I didn't see it working.

Perhaps scroll anchoring should say explicitly that it also applies in cases like resize and rotate?