Re: [w3c/manifest] Add a "tabbed application" mode (#737)

I played with the Chrome OS implementation and noticed that all storage seems to be shared between all tabs. For example, if an app keeps state in `localStorage`, all tabs share the same state. The Windows 95 implementation you [jokingly linked to](https://github.com/w3c/manifest/issues/737#issue-379994475-permalink:~:text=in%20case%20there%20is%20a%20Windows%2095%20implementation) in the original thread has a dedicated section on [child window data](https://docs.microsoft.com/en-us/windows/win32/winmsg/about-the-multiple-document-interface#child-window-data), which lists two ways of storing data, for example, the name of the current file:

- Store child window data in the window structure.
- Use window properties.

Will there be a platform way to do this, or are implementations expected to store state themselves (and if so, what do you propose to re-identify the same tab)? 

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