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StyleForElement doesn't create ancestor computed styles as necessary to
do inheritance correctly. Noticed the listed TEST would trigger a sanity
DCHECK in StyleForElement() for another CL. Without this change we would
inherit styles from initial styles instead of the parent element.

TEST=accessibility/name-calc-visibility.html
TEST=inspector-protocol/accessibility/accessibility-nameSources-visiblity.js

Change-Id: Icd6d669b0ff04f97fcdd637530f56619e8b1f3f0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1789233Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Commit-Queue: Rune Lillesveen <futhark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#694481}