Web Animations: Fix Player's timing update when source content becomes longer

Source/core/animation/css/CSSAnimations.cpp

Index: Source/core/animation/css/CSSAnimations.cpp
diff --git a/Source/core/animation/css/CSSAnimations.cpp b/Source/core/animation/css/CSSAnimations.cpp
index 8510439c1d80502d7f90d25c0777acd4e1c8dd89..80af97a25fe71cc233e4897b2b7b9ef0d194bb7c 100644
--- a/Source/core/animation/css/CSSAnimations.cpp
+++ b/Source/core/animation/css/CSSAnimations.cpp
@@ -289,7 +289,7 @@ void CSSAnimations::calculateAnimationUpdate(CSSAnimationUpdate* update, const E
                         ASSERT(!isAnimationStyleChange);
                         update->updateAnimation(animationName, player, InertAnimation::create(
                             createKeyframeEffect(resolver, animatingElement, element, style, parentStyle, animationName, keyframeTimingFunction.get()),
-                            timing, isPaused, player->currentTimeInternal()), specifiedTiming, keyframesRule);
+                            timing, isPaused, player->unlimitedCurrentTimeInternal()), specifiedTiming, keyframesRule);
                     }
 
                     if (isPaused != player->paused()) {