[web-animations] keyframes should be recomputed when a parent element changes value for a custom property set to "inherit"

[graouts]

a2b572c

[web-animations] keyframes should be recomputed when a parent element changes value for a custom property set to "inherit"
https://bugs.webkit.org/show_bug.cgi?id=251596

Reviewed by Antti Koivisto.

We keep a set of CSS properties set to "inherit" in a KeyframeEffect but until now only considered
"standard" CSS properties. We now also consider custom properties by changing the set's type from
HashSet<CSSPropertyID> to HashSet<AnimatableProperty>.

* LayoutTests/imported/w3c/web-platform-tests/css/css-properties-values-api/at-property-animation-expected.txt:
* LayoutTests/imported/w3c/web-platform-tests/css/css-properties-values-api/at-property-animation.html:
* Source/WebCore/animation/KeyframeEffect.cpp:
(WebCore::KeyframeEffect::updateBlendingKeyframes):
* Source/WebCore/animation/KeyframeEffect.h:
(WebCore::KeyframeEffect::inheritedProperties const):
* Source/WebCore/css/CSSCustomPropertyValue.h:
* Source/WebCore/style/StyleResolver.cpp:
(WebCore::Style::Resolver::keyframeStylesForAnimation):
* Source/WebCore/style/StyleResolver.h:

Canonical link: https://commits.webkit.org/259812@main

d9a2eda

Misc	iOS, tvOS & watchOS	macOS	Linux	Windows
✅ 🧪 style	✅ 🛠 ios	✅ 🛠 mac	✅ 🛠 wpe	🛠 🧪 win
✅ 🧪 bindings	✅ 🛠 ios-sim	✅ 🛠 mac-AS-debug	✅ 🛠 gtk	🛠 wincairo
✅ 🧪 webkitperl	🧪 ios-wk2	✅ 🧪 api-mac	🧪 gtk-wk2
	✅ 🧪 api-ios	✅ 🧪 mac-wk1	🧪 api-gtk
	✅ 🛠 tv	✅ 🧪 mac-wk2
	✅ 🛠 tv-sim	🧪 mac-AS-debug-wk2
	✅ 🛠 watch	✅ 🧪 mac-wk2-stress
	✅ 🛠 watch-sim
✅ 🛠 🧪 unsafe-merge

[webkit-early-warning-system]

EWS run on previous version of this PR (hash 4ad1997)

Misc	iOS, tvOS & watchOS	macOS	Linux	Windows
✅ 🧪 style	✅ 🛠 ios	✅ 🛠 mac	✅ 🛠 wpe	❌ 🛠 🧪 win
✅ 🧪 bindings	✅ 🛠 ios-sim	✅ 🛠 mac-AS-debug	✅ 🛠 gtk	✅ 🛠 wincairo
✅ 🧪 webkitperl	✅ 🧪 ios-wk2	✅ 🧪 api-mac	✅ 🧪 gtk-wk2
	✅ 🧪 api-ios	✅ 🧪 mac-wk1	✅ 🧪 api-gtk
	✅ 🛠 tv	✅ 🧪 mac-wk2
	✅ 🛠 tv-sim	❌ 🧪 mac-AS-debug-wk2
	✅ 🛠 watch	✅ 🧪 mac-wk2-stress
	✅ 🛠 watch-sim

[graouts]

This PR currently builds on top of #9522 and #9523, only the last commit 4ad1997 would be in the final version of this patch.

[webkit-early-warning-system]

EWS run on current version of this PR (hash d9a2eda)

Misc	iOS, tvOS & watchOS	macOS	Linux	Windows
✅ 🧪 style	✅ 🛠 ios	✅ 🛠 mac	✅ 🛠 wpe	🛠 🧪 win
✅ 🧪 bindings	✅ 🛠 ios-sim	✅ 🛠 mac-AS-debug	✅ 🛠 gtk	🛠 wincairo
✅ 🧪 webkitperl	🧪 ios-wk2	✅ 🧪 api-mac	🧪 gtk-wk2
	✅ 🧪 api-ios	✅ 🧪 mac-wk1	🧪 api-gtk
	✅ 🛠 tv	✅ 🧪 mac-wk2
	✅ 🛠 tv-sim	🧪 mac-AS-debug-wk2
	✅ 🛠 watch	✅ 🧪 mac-wk2-stress
	✅ 🛠 watch-sim
✅ 🛠 🧪 unsafe-merge

[webkit-commit-queue]

Committed 259812@main (a2b572c): https://commits.webkit.org/259812@main

Reviewed commits have been landed. Closing PR #9525 and removing active labels.