Re: [w3c/webpayments] Letting the payment app decide between HTTP and Javascript communication (#130)

@tommythorsen can you submit a PR against the proposal that suggests how this might be done.

I like the idea of re-using the mechanism that is used in WebRTC to register an IdP service.
https://w3c.github.io/webrtc-pc/#sec.register-idp

Perhaps we need a `PaymentApp` interface that has a `ProcessPaymentRequestCallback` member that returns a `Promise<PaymentResponse`?

When the user calls `register()` to register the payment app they can pass in either a `start_url` or an implementation of `PaymentApp`.

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