Re: [w3c/payment-request] Allow user activation to be delegated to a child frame to trigger request.show() (#917)

> One consideration might be if payments expects more time to pass between click and PR.show(), for any reason

Sometimes there can be a requirement to perform a server round trip to retrieve the most up to date price, for example. PaymentRequest.show() handles that requirement by allowing a promise for updated payment details to be passed into show() as an optional parameter. Therefore, there is no need to account for such a delay in capability delegation API.

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