Re: [ServiceWorker] IDL: define ContextFrameType (#572)

I mean generally any functional event's event listener (i.e. having no request info as it's not a fetch) might still want to access to `.frameType` of the available service worker clients gotten from `self.clients.getAll()`.

---
Reply to this email directly or view it on GitHub:
https://github.com/slightlyoff/ServiceWorker/issues/572#issuecomment-65969190