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In the other reftests the width of the marker text is not known, so the
references have to rely on some tricks with the ::before pseudo-element.

This patch adds a test that uses the Ahem font, so that the width of the
characters is known. Then the result can be checked with a simpler
reference file.

Note it fails in LayoutNG due to the lack of scrollbar (bug 1012294),
but it passes in legacy.

Bug: 687946
Change-Id: I7fd0856e93d4e489af65b5c767ec81c109804c5c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1879067
Commit-Queue: Oriol Brufau <obrufau@igalia.com>
Reviewed-by: Manuel Rego <rego@igalia.com>
Cr-Commit-Position: refs/heads/master@{#709405}