Re: [w3c/ServiceWorker] Check for Run Service Worker failure and disallow starting redundant workers. (#1419)

Hm, I think it doesn't actually work to make Run Service Worker blocking because then Terminate Service Worker can never be entered while the worker is starting up.

It seems we have to make everything asynchronous or hand-wave that the user agent can abort starting the worker at any time. Or maybe keep it non-blocking and do something like:


1. Run the "Run Service Worker" algorithm.
1. In parallel:
    1. Wait for service worker to be running or to have been aborted by the Terminate Service Worker algorithm.
    1. If service worker is not running, return.
    1. ... continue with dispatching the event etc.

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