Re: [ServiceWorker] Workers & SharedWorkers within ServiceWorkers (#678)

@jrburke I'm not saying the existing case should be replaced as such, but just curious to know for reasoning. Assuming we have `ClientMessageEvent` that has `waitUntil()` (https://github.com/slightlyoff/ServiceWorker/issues/669#issuecomment-88860069), can the logic in the shared worker also be written with a service worker? In that, the client code will do `navigator.serviceWorker.register("email-worker.js")` and use `registration.active.postMessage()` instead of creating a shared worker. And the email worker can use `e.waitUntil(p)` in the event listener of the `message` event.

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