Re: [ServiceWorker] ServiceWorker's postMessage method is not defined (#479)

There's no guarantee about timing either way since it's asynchronous. And the user agent should be in control when it cares about running the worker. But it's fine to define this as if there's no such queue and the worker is booted whenever there's a message (if not already booted), but we should not make the requirements preclude the existence of such a queue.

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