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This tests the behavior as specced in
https://github.com/w3c/csswg-drafts/issues/5257

R=ikilpatrick@chromium.org

Bug: 1045668
Change-Id: I75b945a008b9039b751fc7de54da86cbf399a7ee
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2274255
Commit-Queue: Christian Biesinger <cbiesinger@chromium.org>
Reviewed-by: Ian Kilpatrick <ikilpatrick@chromium.org>
Auto-Submit: Christian Biesinger <cbiesinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#784523}