Re: [w3c/ServiceWorker] Measuring performance with and without Service Worker (#1462)

Does pinterest have a fetch handler?  It will only be non-zero if the service worker is handling the FetchEvent.

Still I don't think workerStart is reliably non-zero across browsers in current implementations.

I have a proposal for the service worker to append additional data to the PerformanceResourceTiming entry that could maybe be used to address your use case here:

https://github.com/wanderview/fetchevent-worker-timing/blob/master/explainer.md

That proposal has not been implemented yet, though.

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