Re: [w3c/push-api] Retry push event (#300)

I'm still having a problem with the premise.  You want multiple activations from the same push message.  Of course that conflicts with `userVisibleOnly`.  The reason that flag exists is to limit the number of activations without visible feedback (which can be used for bad things).

I think that @beverloo was on the right course with the mention of background sync.  That exists specifically to address this class of issue.  You don't want multiple push message deliveries for the same message, you want a way to reactivate the service worker.  Then, if the application server is down, you register with background sync to be awoken again after some time.

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