Animations: Disable compositor when timeline playback rate is set

Source/core/animation/AnimationTimeline.cpp

Index: Source/core/animation/AnimationTimeline.cpp
diff --git a/Source/core/animation/AnimationTimeline.cpp b/Source/core/animation/AnimationTimeline.cpp
index 643a29e0c26a01abc53642435d015adc5d1c6f4a..87b6382d274597b98522ccbb3d7b6c5209bb4779 100644
--- a/Source/core/animation/AnimationTimeline.cpp
+++ b/Source/core/animation/AnimationTimeline.cpp
@@ -236,10 +236,12 @@ void AnimationTimeline::setOutdatedAnimationPlayer(AnimationPlayer* player)
 
 void AnimationTimeline::setPlaybackRate(double playbackRate)
 {
-    // FIXME: need to invalidate compositor animations
     m_currentTimeSnapshot = currentTimeInternal();
     m_rawCurrentTimeSnapshot = m_document->animationClock().currentTime() - zeroTime();
     m_playbackRate = playbackRate;
+    for (const auto& player : m_players) {
+        player->setCompositorPending(true);
+    }
 }
 
 double AnimationTimeline::playbackRate() const