[w3c/manifest] What theme color should be used when a PWA window is out of scope? (#755)

https://www.w3.org/TR/appmanifest/#theme_color-member says

> However, a document may override the default theme color through the inclusion of a valid [HTML] meta element whose name attribute is "theme-color".

I see this as a way for PWAs to dynamically enabled things like dark mode for their site and have the window frame update as well. I don't think it makes sense for an out of scope page to override the app's choice of theme colour though.

What should the theme colour be when out of scope?
A: Manifest theme_color
B: Last used in-scope theme colour
C: Out of scope page theme colour

This question was first raised in: https://bugs.chromium.org/p/chromium/issues/detail?id=872121

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