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In https://github.com/w3c/csswg-drafts/issues/4206, the CSSWG resolved
that the 'text-transform' property should apply to ::marker, and that
by default it should be set to 'none' in the UA stylesheet.
This patch implements these changes.

Note that setting it to 'none' is an observable change in LayoutNG,
since it prevents the ::marker from inheriting the 'text-transform' of
the list item. This was considered a better behavior by the CSSWG, and
it's the behavior that legacy layout already had.

LayoutListMarker, used for ::marker with 'content: normal' in legacy
layout, doesn't implement the marker text as actual text. Therefore,
'text-transform' has no effect.

Bug: 1031667

TEST=external/wpt/css/css-pseudo/marker-default-styles.html
TEST=external/wpt/css/css-pseudo/marker-text-transform-default.html
TEST=external/wpt/css/css-pseudo/marker-text-transform-uppercase.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
TEST=http/tests/devtools/elements/styles-2/pseudo-elements.js

Change-Id: I2c2b554f521139fabb502856fedc6230aa45c787
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2315872Reviewed-by: Koji Ishii <kojii@chromium.org>
Commit-Queue: Oriol Brufau <obrufau@igalia.com>
Cr-Commit-Position: refs/heads/master@{#791815}