[Webkit-unassigned] [Bug 279514] [css-transitions] `getKeyframes()` returns the same values for "from" and "to" with a custom property

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=279514

--- Comment #1 from Antoine Quint <graouts at webkit.org> ---
I think the issue is that we're lacking the equivalent of `ComputedStyleExtractor::valueForPropertyInStyle()` for custom properties and we're wrongly calling `ComputedStyleExtractor::customPropertyValue()` in the `customPropertyValue` lambda under `KeyframeEffect::getKeyframes()`. This means we'll only ever show the current computed value for the target element rather than the keyframe value.

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