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Zero-width floats or in-flow block-level objects that establish a new formatting
context may fit beside preceding floats even if there's zero inline space left.

With this change, a couple of tests start passing, but coverage seems a
bit low, so I added a few new ones.

Had to rebaseline fast/text/word-break.html because a zero-width line
may now fit beside a float that takes up all available inline
space. There was a <br clear=all> in the test that used to insert the
line below such a float. We're now compatible with the others (and our
old selves).

Cq-Include-Trybots: master.tryserver.chromium.linux:linux_layout_tests_layout_ng
Change-Id: Iaf394b7039545eea235b2841457f1662e5890ba9
Reviewed-on: https://chromium-review.googlesource.com/916262
Commit-Queue: Morten Stenshorne <mstensho@chromium.org>
Reviewed-by: Ian Kilpatrick <ikilpatrick@chromium.org>
Reviewed-by: Koji Ishii <kojii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#537000}