Add new environment settings object field "cross site ancestry" for SameSite cookies work #1775
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To define how cookies work correctly, particularly around the SameSite attribute, we need to know whether or not an environment settings object has any cross-site ancestors. This is making sure the ESO definition in ServiceWorkers also defines this member algorithm.
We will have to land the PR that adds this to HTML before landing this, but it'd be nice to get this approved before we alter HTML so everything goes smoothly.
See whatwg/html#9000 for even broader context.
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