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With this patch, legacy layout supports setting the 'content' property
of a ::marker to something different than 'normal' or 'none'.

Bug: 457718

TEST=external/wpt/css/css-pseudo/marker-computed-size.html
TEST=external/wpt/css/css-pseudo/marker-content-002.html
TEST=external/wpt/css/css-pseudo/marker-content-003.html
TEST=external/wpt/css/css-pseudo/marker-content-003b.html
TEST=external/wpt/css/css-pseudo/marker-content-004.html
TEST=external/wpt/css/css-pseudo/marker-content-005.html
TEST=external/wpt/css/css-pseudo/marker-content-006.html
TEST=external/wpt/css/css-pseudo/marker-content-012.html
TEST=external/wpt/css/css-pseudo/marker-content-015.html
TEST=external/wpt/css/css-pseudo/marker-content-017.html
TEST=external/wpt/css/css-pseudo/marker-content-021.html
TEST=external/wpt/css/css-pseudo/marker-hit-testing.html
TEST=external/wpt/css/css-pseudo/marker-intrinsic-contribution-001.html
TEST=fast/css/counters/counterValueForElementById.html

Change-Id: Ib4b9d5661ed2ae0b99e9489c5ce4595f5715f83c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2246573
Commit-Queue: Oriol Brufau <obrufau@igalia.com>
Reviewed-by: Rune Lillesveen <futhark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#785942}