Re: [ServiceWorker] Define some way for foreign fetch to decide on opaqueness of responses (#841)

> I tend to think we need to make it such that each layer needs to use an API to reveal it to the next

Agreed. I don't think this creates a new kind of response. The headers are filtered in the same way they are now via CORS, or the request becomes opaque like it does with no-cors.

The return of `foreignFetchEvent.makeVisibleTo()` should just be a wrapper around the response. `foreignFetchEvent.respondWith()` unwraps it unless there's a security error.

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