Re: [w3c/ServiceWorker] Using BroadcastChannel to wake up a service worker (#975)

> Do we have any use-cases in mind here? I'm not sure we need this.

Maybe not.  I was thinking of the multi-instance stuff we were talking about.  But that does not require waking the worker.

Possibly we don't want ExtendableMessageEvent either since it would let a worker broadcast to itself, get a new waitUntil, and defeat the shutdown timers.

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