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

I have a PWA where I have just added "dark mode" in additional to light (and planning on supporting ``prefers-color-scheme`` query). 
It's a single PWA with single manifest but two color modes - light and dark. I would be really nice to be able to update ``background_color`` and ``theme_color`` to avoid light colors of status bar in dark mode or sudden switch from light splashscreen to dark themed app.
I understand that "dark modes" are coming to OS's and browsers and the ``prefers-color-scheme`` is dynamic - it can be set permanently or setup (I would guess) to change based on time of day.

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