fix: add support for prefers-color-scheme CSS query #19250
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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
zcbenz
approved these changes
Jul 15, 2019
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Backport of #19228
See that PR for details.
Notes: The
prefers-color-schemeCSS media query now works correctly