[w3c/payment-request] Clarification: onshippingaddresschange in case of autofill/pre-filled fields (#887)

Should onshippingaddresschange be triggered through auto-filled/pre-filled values?

_Context:_
To allow for an easy and fast checkout, browsers (e.g. Chrome) pre-fill inputs such as the shipping address with the last observed address.
This currently does not trigger an onshippingaddresschange-event though.
But if I as a merchant want to calculate shipping costs based on the selected address, I have to rely on this event.

The spec describes relevant events as: 

> The user provides a new shipping address.

In terms of the specification what would be the intended behavior?
Since this is a very common use-case, I think this might need clarification in the spec.

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