Re: [w3c/ServiceWorker] event.waitUntil/respondWith vs return promise (#1148)

Currently, with fetch, you have to call `respondWith` during the dispatch of the event to signal that you intend on handling the response. `waitUntil` is separate, as you may wish to do additional work in the service worker related to the fetch, but not handle the response.

Closing, as this is a dupe of #256 and #354.

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