[w3c/payment-request] Should show() consume user activation? (#886)

@aestes, @danyao, @rsolomakhin, moving discussion from #885. 

HTML has a new activation model. Right now, we presumedly have "transient" activation for `show()`:

```JS
window.onclick = () => {
   // set up payment stuff...
   const pay = request.show();
   // Does this succeed or reject? i.e., did .show() "consume" the user activation.
   document.body.requestFullscreen();
}
```

Presumedly, because of the modal nature of `.show()` we want to "consume" the activation, so that things like `requestFullscreen()` would fail if called immediately after `.show()`. 


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