Re: [w3c/manifest] Install button on another domain (#726)

Classically there would be an api like:

```javascript
navigator.permissions.query({name:'appBroaker'}).then(function(result) {
    if (result.state == 'prompt') {
         navigator.appBroaker.add('https://link.to.manifest.json', {options});
    }
});
```

And then a security prompt like "Do you really want to allow this website to install foreign apps?"

In order to realize such an interface, one must consider which authorizations are granted with it.
For example you can:
- Install a serviceworker. 
- Install a fullscreen app.

Perhaps people are not sufficiently familiar with PWAs...

I would very much welcome such an interface, but i don't think players like google, apple and microsoft are willing to risk people getting lost to other webstores. :(


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