Bug 1518009 [wpt PR 14731] - Support for prefers-color-scheme media feature., a=testonly

Bug 1518009 [wpt PR 14731] - Support for prefers-color-scheme media feature., a=testonly

Automatic update from web-platform-tests
Support for prefers-color-scheme media feature.

The preferred color scheme can be passed to the renderer through
Settings, but there is no code in content changing it from the default
value yet.

Spec:

https://drafts.csswg.org/mediaqueries-5/#prefers-color-scheme

Intent to Implement:

https://groups.google.com/a/chromium.org/forum/#!topic/blink-dev/Muw0N43ntSw

Bug: 889087
Change-Id: I859de2953966640baed57ee6d4a5edcbabf9e999
Reviewed-on: https://chromium-review.googlesource.com/c/1396404
Commit-Queue: Rune Lillesveen <futhark@chromium.org>
Reviewed-by: Chris Harrelson <chrishtr@chromium.org>
Reviewed-by: Eric Willigers <ericwilligers@chromium.org>
Cr-Commit-Position: refs/heads/master@{#621528}

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wpt-commits: 839652f5fe7cea050d460104745e427488ac0b9c
wpt-pr: 14731