Don't permit setting SameSite
cookies from cross-site contexts.
#16371
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This is almost entirely based on Mike West's preliminary version:
https://chromium-review.googlesource.com/c/chromium/src/+/1528244
The new enforcement blocks the setup portion of some existing WPT tests,
which verified read behavior, so the helper they use was changed to always
set them in a same-site context by PostMessage'ing to a helper window.
Bug: 837412
Change-Id: Iba95d65ec4d0916fb4dfa581efaede50654792d3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1534237
Commit-Queue: Maks Orlovich <morlovich@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Reviewed-by: Camille Lamy <clamy@chromium.org>
Reviewed-by: Philip Jägenstedt <foolip@chromium.org>
Cr-Commit-Position: refs/heads/master@{#653228}