advance Referrer Policy?

Hi all,

Chrome's implementation of Referrer Policy includes the three newest policy
values in M61 (https://www.chromestatus.com/feature/5634117806850048). I
believe this brings us to two interoperable implementations, covered by
web-platform-tests
<https://github.com/w3c/web-platform-tests/tree/master/referrer-policy>.
I'm told this means it might be time for a CfC to transition to PR.

Thoughts?

Thanks,
Emily