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

What's the status of spec'ing the `beforeinstallprompt` event?  It shipped in blink based only on [the explainer](https://github.com/slightlyoff/AppInstallImprovements/blob/master/explainer.md#controlling-installation) which doesn't seem very precise about the current design.

Anyway it seems pretty close to what you want to me.  Eg. imagine it had been named 'installopportunity' instead.  Do developers care to differentiate between the UA choosing to show a banner, vs. the user explicitly finding the menu option? 

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