Declare onFinish event handler for AnimationPlayer

Source/core/animation/AnimationPlayer.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 220 matching lines @@
     } else {
         if (sourceEnd() == std::numeric_limits<double>::infinity()) {
             exceptionState.throwDOMException(InvalidStateError, "AnimationPlayer has source content whose end time is infinity.");
             return;
         }
         setCurrentTime(sourceEnd());
     }
     ASSERT(finished());
 }
 
+const AtomicString& AnimationPlayer::interfaceName() const
+{
+    return EventTargetNames::AnimationPlayer;
+}
+
+ExecutionContext* AnimationPlayer::executionContext() const
+{
+    if (m_timeline) {
+        if (Document* document = m_timeline->document())
+            return document->contextDocument().get();
+    }
+    return 0;
+}
+
 void AnimationPlayer::setPlaybackRate(double playbackRate)
 {
     if (!std::isfinite(playbackRate))
         return;
     double storedCurrentTime = currentTime();
     m_playbackRate = playbackRate;
     updateTimingState(storedCurrentTime);
 }
 
 void AnimationPlayer::setOutdated()
@@ skipping 75 matching lines @@
 {
     RELEASE_ASSERT(!paused());
     updateTimingState(pauseTime);
     if (!m_isPausedForTesting && hasActiveAnimationsOnCompositor())
         toAnimation(m_content.get())->pauseAnimationForTestingOnCompositor(currentTime());
     m_isPausedForTesting = true;
     pause();
 }
 
 } // namespace