[w3c/ServiceWorker] Make Service Worker control only specific pages (#985)

My use case is to have service workers intercept fetch requests only from a few specific pages. Right now, the only way to control which fetch requests the service worker controls is via the scope parameter via registration, but that is not granular enough. 

It would be great if I could mention which pages the SW should control on registration. 

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https://github.com/w3c/ServiceWorker/issues/985