[Webkit-unassigned] [Bug 211839] [Web Animations] Use CA animations when playbackRate != 1

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=211839

Antoine Quint <graouts at apple.com> changed:

           What    |Removed                     |Added
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                 CC|                            |graouts at apple.com

--- Comment #2 from Antoine Quint <graouts at apple.com> ---
Looks like we can make this work with this approach:

    1. create a CAAnimation
        1. set `animation.duration` to `webAnimation.duration`
        2. set `animation.beginTime` to `-webAnimation.currentTime`
    2. create a CAAnimationGroup
        1. set `group.speed` to `webAnimation.playbackRate`
        2. set `group.duration` to `webAnimation.effect.duration - webAnimation.currentTime`
        3. set `group.animations` to `[animation]`

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