Web Animations: Add a name to AnimationNode and trace running players

Source/core/animation/css/CSSAnimations.h

Index: Source/core/animation/css/CSSAnimations.h
diff --git a/Source/core/animation/css/CSSAnimations.h b/Source/core/animation/css/CSSAnimations.h
index 02d93bcc03a6f1e7170cf2461302443681f3bd24..57be20ae367bb596ae71221f0219d10b8df32b0d 100644
--- a/Source/core/animation/css/CSSAnimations.h
+++ b/Source/core/animation/css/CSSAnimations.h
@@ -56,6 +56,7 @@ class CSSAnimationUpdate FINAL : public NoBaseWillBeGarbageCollectedFinalized<CS
 public:
     void startAnimation(AtomicString& animationName, PassRefPtrWillBeRawPtr<InertAnimation> animation)
     {
+        animation->setName(animationName);
         NewAnimation newAnimation;
         newAnimation.name = animationName;
         newAnimation.animation = animation;
@@ -75,6 +76,7 @@ public:
 
     void startTransition(CSSPropertyID id, CSSPropertyID eventId, const AnimatableValue* from, const AnimatableValue* to, PassRefPtrWillBeRawPtr<InertAnimation> animation)
     {
+        animation->setName(getPropertyName(id));
         NewTransition newTransition;
         newTransition.id = id;
         newTransition.eventId = eventId;