Re: [w3c/ServiceWorker] Making a concurrent request for navigations (#920)

@domenic, that makes sense to me. It's important that we provide a sync way to check this though. There are times where someone might not want to call respondWith if the preload was not sent. I guess maybe we'll need something like event.hasNavigationPreload which is a bool and then event.navigationPreload which is always a Promise<?Request> (ie a promise that will sometimes resolve to a request and other times resolve to null)?

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