Re: [manifest] Manifest format should support some way of including a splash screen (#9)

/cc @PaulKinlan @jakearchibald

I wrote a proof of concept for this using what would be a theme_color with an icon from the Manifest. I'm fairly happy about using the icon. However, I am a bit concerned about the theme_color. It might be very close but not quite exactly the icon's background colour. Also, the theme_color might not be the best solution for a smooth transition. For exmaple, GMail would have a red theme colour with a mostly white content after. They might prefer to have a white-ish loading screen.

Which makes me realise that we could generalise that to help prevent the usual white screen, outside of a splash screen context. For example, if loading an offline-first application would take a couple of hundred milliseconds, a user might still be annoyed by a flash of white. However, if the colour is closed to the page's background, it might be less annoying.

What would you think of introducing something like a ```background_color``` property?

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