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As resolved in https://github.com/w3c/csswg-drafts/issues/4814, allow
::marker to have animations or transitions. But only for the properties
that apply to ::marker.

TEST=external/wpt/css/css-animations/Document-getAnimations.tentative.html
TEST=external/wpt/css/css-animations/animationevent-marker-pseudoelement.html
TEST=external/wpt/css/css-animations/event-order.tentative.html
TEST=external/wpt/css/css-pseudo/parsing/marker-supported-properties.html
TEST=external/wpt/css/css-pseudo/parsing/marker-supported-properties-in-animation.html
TEST=external/wpt/css/css-transitions/Document-getAnimations.tentative.html
TEST=external/wpt/css/css-transitions/non-rendered-element-004.tentative.html

BUG=1054509

Change-Id: Ie86aeb42d4d311264fd5810c1ad89c0fa7b93ab0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2119518
Commit-Queue: Oriol Brufau <obrufau@igalia.com>
Reviewed-by: Anders Hartvoll Ruud <andruud@chromium.org>
Reviewed-by: Rune Lillesveen <futhark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#753752}