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

I got some data from Chrome (Android, stable version 53) about beforeinstallprompt which I can share here:

- 0.026% of page loads get the `beforeinstallprompt` event (but note that this does not necessarily mean they have a listener registered).
- 19% of beforeinstallprompt events have `preventDefault` called.
  - That's surprisingly high.
  - Still, that's just 0.005% of page loads with `BeforeInstallPrompt.preventDefault` called.

Unfortunately, we do not have data about access to `userChoice`. Nor do we have data about the number of `beforeinstallprompt` events that are actually handled by a listener.

All of this is below the unofficial Blink deprecation threshold of 0.03% so we could potentially make breaking changes to this API if the need arises.

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