Emilio Cobos Álvarez 6553f27967 Bug 1762298 - Inherit used color-scheme from embedder <browser> elements. r=nika,dao,Gijs
This allows popups and sidebars to use the chrome preferred
color-scheme.

This moves the responsibility of setting the content-preferred color
scheme to the appropriate browsers to the front-end (via tabs.css).

We still return the PreferredColorSchemeForContent() when there's no
pres context (e.g., for display:none in-process iframes). We could
potentially move a bunch of the pres-context data to the document
instead, but that should be acceptable IMO as for general web content
there's no behavior change in any case.

Differential Revision: https://phabricator.services.mozilla.com/D142578
2022-04-04 18:22:04 +00:00
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