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We were already preventing breaks inside line boxes, but we also need to
do the same for certain types of block nodes, such as replaced content.

Add a unit test for break-before:avoid before monolithic block level
content, since the existing web_tests corpus has no break-between
avoidance tests at all.

Bug: 829028
Change-Id: I2240f96714e6dd760fac4f86089a0c8e6bf346ac
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1836492
Commit-Queue: Ian Kilpatrick <ikilpatrick@chromium.org>
Reviewed-by: Ian Kilpatrick <ikilpatrick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#702465}