Bug 1553477 [wpt PR 16839] - Implement CSS color-scheme property., a=testonly

Bug 1553477 [wpt PR 16839] - Implement CSS color-scheme property., a=testonly

Automatic update from web-platform-tests
Implement CSS color-scheme property.

Implemented behind a flag.

The implementation currently doesn't apply the computed color-scheme to
any rendering.

Spec:

https://drafts.csswg.org/css-color-adjust-1/#color-scheme-prop

Intent to implement:

https://groups.google.com/a/chromium.org/d/topic/blink-dev/xXVJlqlDL_k/discussion

Bug: 939811
Change-Id: Ieec8eb247155c02f0df56a9c637a8e1486c0b404
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1601255
Reviewed-by: Philip Jägenstedt <foolip@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Anders Hartvoll Ruud <andruud@chromium.org>
Commit-Queue: Rune Lillesveen <futhark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#662146}

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wp5At-commits: f391659e705b568cb8013558bcf4d63c8bc24647
wpt-pr: 16839