Re: [w3c/manifest] Add installation prompt control flow (#417)

@mgiuca, @dominickng, do you have an opinion on the following situation:

```JS
window.addeventlistener("beforeinstallprompt", (ev) => {
  // Calling without .preventDefault throws.
  // But is it still possible to call .prompt() after?
  try {
    ev.prompt();
  }catch(err){}
  ev.preventDefault();
  ev.prompt(); // Should this succeed?
  // this will now fail
  ev.prompt();
});
```

That is, should we prevent calling .prompt() twice only after 1 successful call?  

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