[Webkit-unassigned] [Bug 204009] New: [Web Animations] KeyframeEffectStack and KeyframeEffect should indicate whether it only contains accelerated animation properties

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=204009

            Bug ID: 204009
           Summary: [Web Animations] KeyframeEffectStack and
                    KeyframeEffect should indicate whether it only
                    contains accelerated animation properties
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Animations
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: graouts at apple.com
                CC: dino at apple.com

When resolving animations we re-compute whether all animated properties are accelerated to return the `shouldRecompositeLayer` flag in TreeResolver::createAnimatedElementUpdate. We should be able to expose such a property when keyframes on a KeyframeEffect change and then also store it on KeyframeEffectStack and compute that value when the stack is changed.

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