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..ad680b48432f7f717589a9a679dc8c18f5df5e81 100644
--- a/Source/core/animation/AnimationPlayer.h
+++ b/Source/core/animation/AnimationPlayer.h
@@ -32,6 +32,8 @@
 #define AnimationPlayer_h
 
 #include "core/animation/TimedItem.h"
+#include "core/dom/ContextLifecycleObserver.h"
+#include "core/events/EventTarget.h"
 #include "wtf/RefPtr.h"
 
 namespace WebCore {
@@ -39,11 +41,11 @@ namespace WebCore {
 class DocumentTimeline;
 class ExceptionState;
 
-class AnimationPlayer FINAL : public RefCounted<AnimationPlayer> {
-
+class AnimationPlayer FINAL : public RefCounted<AnimationPlayer>, public ContextLifecycleObserver, public EventTargetWithInlineData {
+    REFCOUNTED_EVENT_TARGET(AnimationPlayer);
 public:
     ~AnimationPlayer();
-    static PassRefPtr<AnimationPlayer> create(DocumentTimeline&, TimedItem*);
+    static PassRefPtr<AnimationPlayer> create(ExecutionContext*, DocumentTimeline&, TimedItem*);
 
     // Returns whether this player is still current or in effect.
     bool update();
@@ -66,6 +68,11 @@ 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; }
@@ -118,7 +125,7 @@ public:
     }
 
 private:
-    AnimationPlayer(DocumentTimeline&, TimedItem*);
+    AnimationPlayer(ExecutionContext*, DocumentTimeline&, TimedItem*);
     double sourceEnd() const;
     bool limited(double currentTime) const;
     double currentTimeWithoutLag() const;