Bug 1621899 [wpt PR 22213] - Add tests for color-scheme and iframes.,…

… a=testonly

Automatic update from web-platform-tests
Add tests for color-scheme and iframes.

Iframes where the color-scheme of the iframe element and the iframe
document's root does not match, will get a backdrop matching the color-
scheme of the iframe's root element.

Also adjust existing test according to spec change. See:
w3c/csswg-drafts#4772

Bug: 1058822
Change-Id: I82fd3cc3c2bbf5b4835b157a7522cb22c459ff20
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2095112
Reviewed-by: Anders Hartvoll Ruud <andruudchromium.org>
Commit-Queue: Rune Lillesveen <futharkchromium.org>
Cr-Commit-Position: refs/heads/master{#750186}

--

wpt-commits: 348adc5c7b2e3abb76763af063fbd921afb99ac5
wpt-pr: 22213

UltraBlame original commit: e0db51ee811dc6abb6d0897bbbf56a8ed8fdb1f0

testing/web-platform/tests/css/css-color-adjust/rendering/dark-color-scheme/color-scheme-iframe-background-mismatch-alpha.html

@@ -0,0 +1,181 @@
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testing/web-platform/tests/css/css-color-adjust/rendering/dark-color-scheme/color-scheme-iframe-background-mismatch-opaque.html

@@ -0,0 +1,186 @@
+<
+!
+doctype
+html
+>
+<
+title
+>
+CSS
+Color
+Adjustment
+Test
+:
+Frames
+with
+a
+dark
+color
+-
+scheme
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+<
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+title
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+"
+help
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+href
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+https
+:
+/
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+drafts
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+csswg
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+org
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+css
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+#
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+css
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