Re: [ServiceWorker] Message-driven communication between workers and consumers (#580)

The problem is that ports to posting messages only are available in `message` events inside the worker. 
My idea is to send messages to the controlled pages when a `fetch` event is handled properly in order to synchronization state with the parent page. 

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https://github.com/slightlyoff/ServiceWorker/issues/580#issuecomment-66121846