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Implement UKM metrics in storage_partition_impl to record when cookies
are sent or set across schemes.
This is the UKM version of the UMAs
Cookie.SameSiteDifferentSchemeRequest and
Cookie.SameSiteDifferentSchemeResponse.

Doing so requires that the CookieInclusionStatus warning field be
expanded to include cross-scheme warnings.

Bug: 1030938
Change-Id: Iad13d610ae39e4d250157394459297698a2879de
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2015353Reviewed-by: Steven Holte <holte@chromium.org>
Reviewed-by: Maksim Orlovich <morlovich@chromium.org>
Reviewed-by: Charlie Reis <creis@chromium.org>
Commit-Queue: Steven Bingler <bingler@chromium.org>
Cr-Commit-Position: refs/heads/master@{#736165}