Move Animatable* hierarchy into new folder.

Source/core/animation/animatable/AnimatableSVGLength.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 AnimatableSVGLength_h
 #define AnimatableSVGLength_h
 
-#include "core/animation/AnimatableValue.h"
+#include "core/animation/animatable/AnimatableValue.h"
 #include "core/svg/SVGLength.h"
 
 namespace WebCore {
 
 class AnimatableSVGLength FINAL : public AnimatableValue {
 public:
     virtual ~AnimatableSVGLength() { }
 
     static PassRefPtrWillBeRawPtr<AnimatableSVGLength> create(PassRefPtr<SVGLength> length)
     {
@@ skipping 20 matching lines @@
     virtual bool equalTo(const AnimatableValue*) const OVERRIDE;
 
     RefPtr<SVGLength> m_length;
 };
 
 DEFINE_ANIMATABLE_VALUE_TYPE_CASTS(AnimatableSVGLength, isSVGLength());
 
 } // namespace WebCore
 
 #endif // AnimatableSVGLength_h