Re: [w3c/manifest] Support a way to update explicilty (#446)

@adrianhopebailie, about "installing explicitly", most browser vendors would like to pursue the [installabiltiy signals](https://w3c.github.io/manifest/#installability-signals) route. If that doesn't work out, we might need to add an .requestInstall() API. However, we have resisted that option because we don't want install buttons all over the web. 

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