Re: [w3c/ServiceWorker] consider allowing multiple worker thread instances for a single registration (#756)

@wanderview 
> I can't think of any valid use case for initiating a postMessage from the window to a service worker. Anything you can do in the service worker (Cache API, etc) you can do from the window.

Well, I have one. When I need to apply update, I send a message to SW to do `skipWaiting()`.  See this: https://github.com/NekR/offline-plugin/blob/master/tpls/runtime-template.js#L184

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