Re: [ServiceWorker] Promise on navigator.serviceWorker that resolves when page is controlled (#799)

@jakearchibald , I agree but you can not use them because there is a small windows between activating and activated where you don't receive functional events (like @jeffposnick discovered). It only can when it is fully activated. So, as @wanderview suggest we should resolve `.ready` when activated. The other option is to stall functional events until activation completion but this could be harmful if someone is extending the event for a long time.

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