Declare onFinish event handler for AnimationPlayer

Source/core/animation/AnimationPlayer.cpp

Index: Source/core/animation/AnimationPlayer.cpp
diff --git a/Source/core/animation/AnimationPlayer.cpp b/Source/core/animation/AnimationPlayer.cpp
index 48351215c4e60238decff833135fed84c1410bb3..96d7a5c03ab289ba7e6470e9747099978fc96392 100644
--- a/Source/core/animation/AnimationPlayer.cpp
+++ b/Source/core/animation/AnimationPlayer.cpp
@@ -46,13 +46,14 @@ static unsigned nextSequenceNumber()
 
 }
 
-PassRefPtr<AnimationPlayer> AnimationPlayer::create(DocumentTimeline& timeline, TimedItem* content)
+PassRefPtr<AnimationPlayer> AnimationPlayer::create(ExecutionContext* context, DocumentTimeline& timeline, TimedItem* content)
 {
-    return adoptRef(new AnimationPlayer(timeline, content));
+    return adoptRef(new AnimationPlayer(context, timeline, content));
 }
 
-AnimationPlayer::AnimationPlayer(DocumentTimeline& timeline, TimedItem* content)
-    : m_playbackRate(1)
+AnimationPlayer::AnimationPlayer(ExecutionContext* context, DocumentTimeline& timeline, TimedItem* content)
+    : ActiveDOMObject(context)
+    , m_playbackRate(1)
     , m_startTime(nullValue())
     , m_holdTime(nullValue())
     , m_storedTimeLag(0)
@@ -238,6 +239,16 @@ void AnimationPlayer::finish(ExceptionState& exceptionState)
     ASSERT(finished());
 }
 
+const AtomicString& AnimationPlayer::interfaceName() const
+{
+    return EventTargetNames::AnimationPlayer;
+}
+
+ExecutionContext* AnimationPlayer::executionContext() const
+{
+    return ActiveDOMObject::executionContext();
+}
+
 void AnimationPlayer::setPlaybackRate(double playbackRate)
 {
     if (!std::isfinite(playbackRate))