Re: [w3c/payment-request] Add way to update `total` and `displayItems` after `.show()` but before user interaction (#645)

(I work with @jenan-stripe.)

> The alternative is for Payment Request implementors to ... show a manually-created loading modal (probably also not great).

It's worth noting that this workaround is not ideal, because `show()` may not always be callable without a user gesture. This is allowed for by the spec:

> For example, the user agent may require the call to be triggered by user activation

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