Re: [slightlyoff/ServiceWorker] spec should queue tasks to expose attribute changes on ServiceWorker and ServiceWorkerRegistration (#860)

One thing that I noticed in Chrome is that after `updatefound` and having `registration.installing` SW, that `installing` SW may fire `statechange` to `installing`. This is why I have to use such guards as `ignoreInstalling` (state) after I already found installing Service Worker in registration.

I guess it's just a race, but a bad one.

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