Re: [w3c/ServiceWorker] Consider exposing Page Lifecycle state to service-worker (#1345)

I can see a use case for when you are using service workers as an alternative to sending pixel heart beats and want a more reliable way of knowing when a window has closed instead of using a timeout in the sw to know when a window has stopped sending data to it.  Also helpful for knowing when windows have been backgrounded which changes how the window functions (timeout min becomes 1 sec, etc) but not the service worker.

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