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If there's no class C breakpoint (i.e. non-zero gap) between the outer
block-end edge of the last child and the inner block-end edge of its
container, we really don't want to break there. We also don't want to
break *inside* the block-end border/padding area.

Only allow breaking here if there are no real preceding breakpoints.

Bug: 829028
Change-Id: If922143923446060702eec5cfb8f7b2fbed06a10
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2264296
Commit-Queue: Morten Stenshorne <mstensho@chromium.org>
Reviewed-by: Ian Kilpatrick <ikilpatrick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#782980}