Re: [slightlyoff/ServiceWorker] Allow waitUntil to be called multiple times, async (#771)

Chrome wants to implement this to fix our broken FetchEvent.waitUntil() implementation <https://bugs.chromium.org/p/chromium/issues/detail?id=601095>. Can we get spec text? Informally, it sounds like:

- FetchEvent.respondWith must be called synchronously in the event handler (at most one time)
- FetchEvent.waitUntil can be called at any time while the worker is alive, and the browser will respect that hint
- The browser tries to keep the worker alive as long as any respondWith or waitUntil promise for the event is pending.

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