Re: [w3c/payment-request] Add ability to request billing address (#749)

@domenic,

billingAddress should be part of the payment method data. The thing is that in some cases, the Total depends on the billingAddress (e.g., VAT computation). The merchant wants to know about the billingAddress while the sheet is open to display a correct total. 

I believe the solution of this pull request will work for those payment methods build into the browser (e.g., basic card). However it will not work for some payment methods supported by payment handlers (e.g., for push payments or real-time credit financing) until we do something else. I'm synthesizing what I'm hearing here:
 https://github.com/w3c/payment-request/wiki/PushPayments

Ian

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