Web Animations API: Ensure timing is updated if a RAF callback makes a player outdated.

Source/core/page/PageAnimator.cpp

Index: Source/core/page/PageAnimator.cpp
diff --git a/Source/core/page/PageAnimator.cpp b/Source/core/page/PageAnimator.cpp
index c2255481bb51838a961950b138e3f22151e50ae0..33b2d8365e336c68681c12392a40b464b532858b 100644
--- a/Source/core/page/PageAnimator.cpp
+++ b/Source/core/page/PageAnimator.cpp
@@ -41,6 +41,10 @@ void PageAnimator::serviceScriptedAnimations(double monotonicAnimationStartTime)
 
     for (size_t i = 0; i < documents.size(); ++i)
         documents[i]->serviceScriptedAnimations(monotonicAnimationStartTime);
+
+    // Frame callbacks might have started new players or caused existing players to become outdated.
+    for (size_t i = 0; i < documents.size(); ++i)
+        DocumentAnimations::updateOutdatedAnimationPlayersAfterFrameCallbacks(*documents[i]);
 }
 
 void PageAnimator::scheduleVisualUpdate()