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The CSSWG resolved in https://github.com/w3c/csswg-drafts/issues/4568
that inherited properties that apply to text can be set on ::marker and
should affect the marker text.

Therefore, this patch allows 'hyphens', 'letter-spacing', 'line-break',
'overflow-wrap', 'tab-size', 'word-break', and 'word-spacing' in marker.

Note it was already possibly to set these properties in the list item
and the ::marker would inherit them. This patch just lets authors set
them directly on the ::marker.

I would have allowed 'text-justify' too but it's not enabled by default
and in LayoutNG it has no effect on inline boxes (bug 1124043), so it
didn't seem worth it.

Bug: 1031667

TEST=external/wpt/css/css-pseudo/marker-hyphens.html
TEST=external/wpt/css/css-pseudo/marker-letter-spacing.html
TEST=external/wpt/css/css-pseudo/marker-line-break.html
TEST=external/wpt/css/css-pseudo/marker-overflow-wrap.html
TEST=external/wpt/css/css-pseudo/marker-tab-size.html
TEST=external/wpt/css/css-pseudo/marker-word-break.html
TEST=external/wpt/css/css-pseudo/marker-word-spacing.html
TEST=external/wpt/css/css-pseudo/parsing/marker-supported-properties-in-animation.html
TEST=external/wpt/css/css-pseudo/parsing/marker-supported-properties.html

Some tests fail in legacy because ::markers with 'content: normal' are
not implemented with actual text.

Change-Id: I2086854796fd355928591ee4c85f241337b33445
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2388384Reviewed-by: Rune Lillesveen <futhark@chromium.org>
Commit-Queue: Oriol Brufau <obrufau@igalia.com>
Cr-Commit-Position: refs/heads/master@{#803839}