Re: [w3c/ServiceWorker] Improve handling of extend lifetime promises (#1049)

> Hmm, do you even need to go in parallel/queue a task? It seems like for promises you should be able to just do "upon fulfillment"/"upon rejection".

I don't think we can guarantee the expected sequence by using "upon fulfillment"/"upon rejection" here. This `promise.then` for decreasing the count should be called after all the `promise.then()` functions called during the event dispatch. Either queuing a normal task or explicitly specifying the order of the microtask seems to be needed.

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