[w3c/manifest] Allow installed PWA to run on OS login (#845)

I think we should standardize it before its wrong approaches spreads out.
Details in https://github.com/MicrosoftEdge/MSEdgeExplainers/blob/master/RunOnLogin/Explainer.md and https://bugs.chromium.org/p/chromium/issues/detail?id=897302

![pwa-dialog](https://user-images.githubusercontent.com/183966/72961965-9834d780-3dbb-11ea-98aa-92c6dac8eb8f.png)

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Received on Thursday, 23 January 2020 06:38:46 UTC