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These functions will eventually be used to compute SameParty-ness by the
SameParty cookie implementation.

Bug: 1143756
Change-Id: Ib9ac724c4a3d6053c0ed6886e8dc0acdefc050f8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2586148
Commit-Queue: Chris Fredrickson <cfredric@chromium.org>
Auto-Submit: Chris Fredrickson <cfredric@chromium.org>
Reviewed-by: Lily Chen <chlily@chromium.org>
Reviewed-by: Maksim Orlovich <morlovich@chromium.org>
Cr-Commit-Position: refs/heads/master@{#836805}