Re: [w3c/ServiceWorker] Central algorithm for updating service worker state and registrations (#1416)

I found the code that guarantees that controllerchange from a worker going active will occur after the statechange events:

https://searchfox.org/mozilla-central/rev/f8b11433159cbc9cc80500b3e579d767473fa539/dom/serviceworkers/ServiceWorkerRegistrationInfo.cpp#329-335

The TransitionWaitingToActive() will queue a task for the statechange stuff and then UpdateClientControllers() will queue a task for controllerchange events.  Of course, there is nothing here for updatefound because updatefound is not fired for activating a worker.

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