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

Wait, why would `event.request.origin` match `location.origin`? I don't think it should. 

We also need to think through if this creates a new kind of filtered response and what returning such a filter response elsewhere would do. E.g., with nested foreign fetch (I tend to think we need to make it such that each layer needs to use an API to reveal it to the next).

Reusing CORS directly doesn't work, since we want CORS responses to become opaque responses by default.

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