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

It sounds to me like we're converging on introducing a new `install` event (subject to name bikeshedding).

@felquis - I see the desire for the boolean too, although I worry that it's overly simple since the user may have installed the site but since uninstalled it (which Chrome is unable to detect today, FWIW), or visited it now in browser mode for some reason despite having installed it previously. I suggest for now that you listen for the event and write it to localstorage, which provides basically what you want but without requiring another piece of standardization.

I suggest we go ahead with standardizing the new event. Sound good?

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