Re: [ServiceWorker] Proposal: Optimized No-Fetch Service Workers (#718)

@fatlotus are we seeing many SWs without a fetch event? I know there's a few at the moment to trigger Chrome's app install banner, but we're going to start tightening the heuristics here, we only want to promote add-to-homescreen for sites that have some offline capability.

Listeners should be deterministically added to the SW global during initial execution. Both the `Math.random` case and adding listeners later are antipatterns.

+@slightlyoff 

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