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

@mounirlamouri asked:
> Maybe you could mention the reasons regarding the differences?

Mainly, the Chrome implementation fails to handle case 1. 

Also, there are a number of unclear things about the Chrome implementation. Like, why is the platform needed? Won't the platform always just match the platform you are on (e.g., As a user: I'm in Chrome on Android; I see the app banner and install the Android app... I can't install the iOS app, as I'm, you know, on Android!?). 

The same applies to BeforeInstallPromptEventInit, why do you need the platform there?

Why do you need both `Promise<void> prompt()` and .userChoice, when prompt() can answer the question for you? 


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