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This adds parsing support for a "SameParty" cookie attribute, which is a
boolean attribute (similar to "Secure" or "HttpOnly") to ParsedCookie.
Nothing uses this attribute yet.

Bug: 1142606
Change-Id: Ib1543df24ceefb1bb67be7fefd436a322d278f32
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2500481Reviewed-by: Maksim Orlovich <morlovich@chromium.org>
Reviewed-by: Dan McArdle <dmcardle@chromium.org>
Commit-Queue: Lily Chen <chlily@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821237}