Re: [heycam/webidl] Define the `[CrossOriginIsolated]` extended attribute. (#883)

This looks pretty close to landing, and https://github.com/WICG/performance-measure-memory/ would like to use it. I'm happy to carry this over the finish line, but can someone confirm for me what's left to do? My read is:

- Update to cross-link to the HTML spec definition of "cross-origin isolated", now that it exists. Since it lives on an agent cluster I guess we'll need to indirect a bit; something like global -> relevant agent -> agent cluster -> cross-origin isolated.

- Specify the restrictions @annevk prefers on doubling this up with [SecureContext]. In particular, I think it suffices to say something like "[SecureContext] must not be specified when a construct is conditionally exposed on [CrossOriginIsolated]; doing so would be redundant, since every environment which is cross-origin isolated is also a secure context".

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