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Even if a list item has 'list-style-position: outside', Chromium may
force its marker to be inside when it's a <li> outside a list element.

This information was stored in layout, but this created an undesirable
dependency since the computed 'display' value of the marker depends on
whether it's inside or outside. And it wasn't possible to force a marker
with non-normal 'content' to be inside.

This patch fixes it by adding an internal 'IsInsideListElement' flag in
ComputedStyle. This design also avoids traversing all the ancestors of
every <li> element.

BUG=457718

TEST=external/wpt/css/css-pseudo/marker-content-015.html

The test fails in legacy since 'content' is not supported yet.

Change-Id: I2df70841e8e9d729fd4aa47ec9b9973c09a82dcb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1973914Reviewed-by: Rune Lillesveen <futhark@chromium.org>
Commit-Queue: Oriol Brufau <obrufau@igalia.com>
Cr-Commit-Position: refs/heads/master@{#726310}