Declare onFinish event handler for AnimationPlayer

Source/core/animation/AnimationPlayer.h

Index: Source/core/animation/AnimationPlayer.h
diff --git a/Source/core/animation/AnimationPlayer.h b/Source/core/animation/AnimationPlayer.h
index e8b79ba703ce94f39fd465026292a92e015d2863..0dee2b2d798a9d665a25fc633564df7c018bda20 100644
--- a/Source/core/animation/AnimationPlayer.h
+++ b/Source/core/animation/AnimationPlayer.h
@@ -32,6 +32,7 @@
 #define AnimationPlayer_h
 
 #include "core/animation/TimedItem.h"
+#include "core/events/EventTarget.h"
 #include "wtf/RefPtr.h"
 
 namespace WebCore {
@@ -39,8 +40,8 @@ namespace WebCore {
 class DocumentTimeline;
 class ExceptionState;
 
-class AnimationPlayer FINAL : public RefCounted<AnimationPlayer> {
-
+class AnimationPlayer FINAL : public RefCounted<AnimationPlayer>, public EventTargetWithInlineData {
+    REFCOUNTED_EVENT_TARGET(AnimationPlayer);
 public:
     ~AnimationPlayer();
     static PassRefPtr<AnimationPlayer> create(DocumentTimeline&, TimedItem*);
@@ -66,6 +67,11 @@ public:
     void finish(ExceptionState&);
     bool finished() { return limited(currentTime()); }
 
+    DEFINE_ATTRIBUTE_EVENT_LISTENER(finish);
+
+    virtual const AtomicString& interfaceName() const OVERRIDE;
+    virtual ExecutionContext* executionContext() const OVERRIDE;
+
     double playbackRate() const { return m_playbackRate; }
     void setPlaybackRate(double);
     const DocumentTimeline* timeline() const { return m_timeline; }