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As part of the "First Party Sets" privacy effort, cookies get a new
boolean attribute 'SameParty'. The attribute works similarly as
'SameSite' and allows cookies to be sent in same-party, cross-site
contexts.

This CL adds the attribute to the DevTools protocol, so it can be
shown in the various Cookie tables in the DevTools frontend.

R=caseq@chromium.org

Bug: chromium:1161427
Change-Id: Ica094fcc3acc38e8fb36cada40c198c41ca82262
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2598846Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
Commit-Queue: Simon Zünd <szuend@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841959}