Samuel Attard ab8b940151 fix: add support for prefers-color-scheme CSS query (#19228) ...

The wiring to update prefs when you toggle between dark mode and light mode exists in the content layer but the actual value setting is done in either //chrome or in shell.  We need to set the preferred_color_scheme pref value in order for the CSS query to work correctly.  The DarkModeObserver in content will automatically regenerate prefs when dark mode is toggled.

Fixes #15540

2019-07-15 17:22:25 +09:00

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