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This adds a histogram to log the SameSite attribute on every attempt to
create a SameParty cookie.

Bug: 1142606
Change-Id: Ic63373aea2916ea3d9c9c666880535b05a3031ae
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2510492Reviewed-by: Maksim Orlovich <morlovich@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Commit-Queue: Lily Chen <chlily@chromium.org>
Cr-Commit-Position: refs/heads/master@{#822820}