Re: [manifest] Allow developers to detect when the user has added the site to their home screen (or equivalent) (#417)

What about

```
engagementchange(EngagementChangeReason reason)

enum EngagementChangeReason {
  "uninstalled",
  "installed-manually",
  "install-prompt-shown",
  "install-prompt-cancelled",
  "install-prompt-accepted",
  "install-prompt-denied"
}
```

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https://github.com/w3c/manifest/issues/417#issuecomment-165442341