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This change adds support for the prefers-contrast media query and adds
PreferredContrast to settings. The logic for updating PreferredContrast
from its default state based on the OS will be implemented in a
follow-up change.

Spec:
https://drafts.csswg.org/mediaqueries-5/#prefers-contrast

Intent to prototype:
https://groups.google.com/a/chromium.org/g/blink-dev/c/I0e2_nAwW7E

Bug: 1107431
Change-Id: Ie09df9069c979caf944d8af1d5f6bde80f40e8ea
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2410646
Commit-Queue: Alison Maher <almaher@microsoft.com>
Reviewed-by: Rune Lillesveen <futhark@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#818576}