Re: [manifest] Integration with service workers (#161)

@benfrancis 

> https://evernote.com/ might not register the Service Worker, but https://evernote.com/Home.action would

Why would you want to offer ServiceWorker features to home-screen-launched but not browser visited?

> Another use case I just thought of is that when a user uninstalls the app from their operating system, the service_worker property could perhaps also be used to unregister the Service Worker.

That doesn't feel right if the browser & home-screen-thing share storage and SW. I wouldn't expect removing a home screen icon to remove features I previously had in the browser, maybe even features that were registered in the browser. If the home-screen-thing has a different storage & SW, the system can detect which origins the user has icons for and remove storage & SW without the manifest.

> calling home to measure install metrics

How would you tell the difference between a normal SW install, and one triggered from add-to-homescreen?

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