Ship same-site cookies.

Spec: https://tools.ietf.org/html/draft-west-first-party-cookies

Intent to Ship: https://groups.google.com/a/chromium.org/forum/#!topic/blink-dev/csCtW3M3-wg

BUG=459154

Review URL: https://codereview.chromium.org/1833853002

Cr-Commit-Position: refs/heads/master@{#383485}
4 files changed