Re: [w3c/webpayments-payment-apps-api] The relationship between payment apps and service workers (#33)

> What's the benefit of having this in the manifest?

A Payment App has some meta-data (the list of payment methods is can handle) that is important to register with the browser during registration. A manifest seems like the right way to do this.

That is not so say it's the only way but it seems like there could be better alignment of what's being done to extend `ServiceWorkerRegistration` and extend manifest.

@tommythorsen - I don't have a strong personal preference between `onmessage` and 

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