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Determine which cookie context, schemeless vs schemeful, to use based
on the LegacySameSiteCookieBehaviorEnabled and
LegacySameSiteCookieBehaviorEnabledForDomainList enterprise policies.

This functionality may also be triggered if SameSiteByDefaultCookies
is disabled. This seems acceptable because it's odd to decrease
SameSite protections by disabling SameSiteByDefaultCookies but also
want to increase those protections by having Schemeful Same-Site.

Also update the documentation for the policies.

Bug: 1101037
Change-Id: I6f74f6448147b451bbf8ae5aa0157277dd00639c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2283505Reviewed-by: Maksim Orlovich <morlovich@chromium.org>
Reviewed-by: Pavol Marko <pmarko@chromium.org>
Reviewed-by: Lily Chen <chlily@chromium.org>
Reviewed-by: Christian Dullweber <dullweber@chromium.org>
Commit-Queue: Steven Bingler <bingler@chromium.org>
Cr-Commit-Position: refs/heads/master@{#789467}