Move Animatable* hierarchy into new folder.

Source/core/animation/animatable/AnimatableNeutral.h

 /*
  * 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 13 matching lines @@
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef AnimatableNeutral_h
 #define AnimatableNeutral_h
 
-#include "core/animation/AnimatableValue.h"
+#include "core/animation/animatable/AnimatableValue.h"
 
 namespace WebCore {
 
 class AnimatableNeutral FINAL : public AnimatableValue {
 public:
     virtual ~AnimatableNeutral() { }
 
     virtual void trace(Visitor* visitor) OVERRIDE { AnimatableValue::trace(visitor); }
 
 protected:
@@ skipping 10 matching lines @@
     virtual bool equalTo(const AnimatableValue* value) const OVERRIDE
     {
         ASSERT_NOT_REACHED();
         return true;
     }
 };
 
 } // namespace WebCore
 
 #endif // AnimatableNeutral_h