Re: [w3c/payment-request] Add way to update `total` and `displayItems` before `.show()` (#639)

@rsolomakhin Ah, fascinating! Thanks for detailed response and Chrome details!

That sounds like a great workaround, but it sort of falls out of some assumptions about the API rather than specific contracts, right?

1. Right now, it looks like the Payment Handler spec [says](https://www.w3.org/TR/payment-handler/#the-paymentrequestevent) that handlers receive `total` (although it's not clear to me how `canMakePayment` events differ from these -- am I looking in the wrong place?)
2. The spec is rather light on `canMakePayment()` implementation details. There doesn't seem to be anything stopping a browser from forcing `canMakePayment()` being called before `show()`, right?

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