Re: [ServiceWorker] Allow respondWith() to be called asynchronously or allow some way to cancel the response. (#836)

@mkruisselbrink yes, JS is not blocking. Is the underlaying `respondWith()` mechanism which is blocked.

@wanderview, so `null` or `undefined` are the "cancel values" for `respondWith. The "no one wants to intercept this" scenario is not very different from having a `respondWith()` passed with a promise that never resolves. Actually, it is slightly better as you could answer from the network instead.

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