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A block that has zero block-size fits within zero space, so if we have
exactly zero space left in a fragmentainer, the block shouldn't be
pushed to the next fragmentainer.

Discovered this while working on column-rule support;
fast/multicol/span/triply-nested-multiocol-zero-height-inner-with-spanner.html
started to fail, because we had one column more than expected.

fast/multicol/transform-inside-opacity.html will regress with this
change, because we're really bad at fragmenting floats, and now the poor
float ended up exactly at the end of the first column (instead of
(incorrectly but oh so helpfully) being pushed to the beginning of the
next by its parent).

Bug: 829028
Change-Id: I66d44699c44cf7e7371f196babd424a971bfd65d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1899769
Commit-Queue: Ian Kilpatrick <ikilpatrick@chromium.org>
Reviewed-by: Ian Kilpatrick <ikilpatrick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712609}