Move Animatable* hierarchy into new folder.

Source/core/core.gypi

 {
     'includes': [
       'core_generated.gypi',
     ],
     'variables': {
         # Files for which bindings (.cpp and .h files) will be generated
         'core_idl_files': [
             'animation/Animation.idl',
             'animation/AnimationEffect.idl',
             'animation/AnimationPlayer.idl',
@@ skipping 561 matching lines @@
             'accessibility/AXTableCell.cpp',
             'accessibility/AXTableCell.h',
             'accessibility/AXTableColumn.cpp',
             'accessibility/AXTableColumn.h',
             'accessibility/AXTableHeaderContainer.cpp',
             'accessibility/AXTableHeaderContainer.h',
             'accessibility/AXTableRow.cpp',
             'accessibility/AXTableRow.h',
             'animation/ActiveAnimations.cpp',
             'animation/ActiveAnimations.h',
-            'animation/AnimatableClipPathOperation.cpp',
-            'animation/AnimatableClipPathOperation.h',
-            'animation/AnimatableColor.cpp',
-            'animation/AnimatableColor.h',
-            'animation/AnimatableDouble.cpp',
-            'animation/AnimatableDouble.h',
-            'animation/AnimatableFilterOperations.cpp',
-            'animation/AnimatableFilterOperations.h',
-            'animation/AnimatableImage.cpp',
-            'animation/AnimatableImage.h',
-            'animation/AnimatableLength.cpp',
-            'animation/AnimatableLength.h',
-            'animation/AnimatableLengthBox.cpp',
-            'animation/AnimatableLengthBox.h',
-            'animation/AnimatableLengthBoxAndBool.cpp',
-            'animation/AnimatableLengthBoxAndBool.h',
-            'animation/AnimatableLengthPoint.cpp',
-            'animation/AnimatableLengthPoint.h',
-            'animation/AnimatableLengthPoint3D.cpp',
-            'animation/AnimatableLengthPoint3D.h',
-            'animation/AnimatableLengthSize.cpp',
-            'animation/AnimatableLengthSize.h',
-            'animation/AnimatableNeutral.h',
-            'animation/AnimatableRepeatable.cpp',
-            'animation/AnimatableRepeatable.h',
-            'animation/AnimatableSVGLength.cpp',
-            'animation/AnimatableSVGLength.h',
-            'animation/AnimatableSVGPaint.cpp',
-            'animation/AnimatableSVGPaint.h',
-            'animation/AnimatableShadow.cpp',
-            'animation/AnimatableShadow.h',
-            'animation/AnimatableShapeValue.cpp',
-            'animation/AnimatableShapeValue.h',
-            'animation/AnimatableStrokeDasharrayList.cpp',
-            'animation/AnimatableStrokeDasharrayList.h',
-            'animation/AnimatableTransform.cpp',
-            'animation/AnimatableTransform.h',
-            'animation/AnimatableUnknown.h',
-            'animation/AnimatableValue.cpp',
-            'animation/AnimatableValue.h',
-            'animation/AnimatableValueKeyframe.cpp',
-            'animation/AnimatableValueKeyframe.h',
-            'animation/AnimatableVisibility.cpp',
-            'animation/AnimatableVisibility.h',
+            'animation/animatable/AnimatableClipPathOperation.cpp',
+            'animation/animatable/AnimatableClipPathOperation.h',
+            'animation/animatable/AnimatableColor.cpp',
+            'animation/animatable/AnimatableColor.h',
+            'animation/animatable/AnimatableDouble.cpp',
+            'animation/animatable/AnimatableDouble.h',
+            'animation/animatable/AnimatableFilterOperations.cpp',
+            'animation/animatable/AnimatableFilterOperations.h',
+            'animation/animatable/AnimatableImage.cpp',
+            'animation/animatable/AnimatableImage.h',
+            'animation/animatable/AnimatableLength.cpp',
+            'animation/animatable/AnimatableLength.h',
+            'animation/animatable/AnimatableLengthBox.cpp',
+            'animation/animatable/AnimatableLengthBox.h',
+            'animation/animatable/AnimatableLengthBoxAndBool.cpp',
+            'animation/animatable/AnimatableLengthBoxAndBool.h',
+            'animation/animatable/AnimatableLengthPoint.cpp',
+            'animation/animatable/AnimatableLengthPoint.h',
+            'animation/animatable/AnimatableLengthPoint3D.cpp',
+            'animation/animatable/AnimatableLengthPoint3D.h',
+            'animation/animatable/AnimatableLengthSize.cpp',
+            'animation/animatable/AnimatableLengthSize.h',
+            'animation/animatable/AnimatableNeutral.h',
+            'animation/animatable/AnimatableRepeatable.cpp',
+            'animation/animatable/AnimatableRepeatable.h',
+            'animation/animatable/AnimatableSVGLength.cpp',
+            'animation/animatable/AnimatableSVGLength.h',
+            'animation/animatable/AnimatableSVGPaint.cpp',
+            'animation/animatable/AnimatableSVGPaint.h',
+            'animation/animatable/AnimatableShadow.cpp',
+            'animation/animatable/AnimatableShadow.h',
+            'animation/animatable/AnimatableShapeValue.cpp',
+            'animation/animatable/AnimatableShapeValue.h',
+            'animation/animatable/AnimatableStrokeDasharrayList.cpp',
+            'animation/animatable/AnimatableStrokeDasharrayList.h',
+            'animation/animatable/AnimatableTransform.cpp',
+            'animation/animatable/AnimatableTransform.h',
+            'animation/animatable/AnimatableUnknown.h',
+            'animation/animatable/AnimatableValue.cpp',
+            'animation/animatable/AnimatableValue.h',
+            'animation/animatable/AnimatableValueKeyframe.cpp',
+            'animation/animatable/AnimatableValueKeyframe.h',
+            'animation/animatable/AnimatableVisibility.cpp',
+            'animation/animatable/AnimatableVisibility.h',
             'animation/Animation.cpp',
             'animation/Animation.h',
             'animation/AnimationClock.cpp',
             'animation/AnimationClock.h',
             'animation/AnimationEffect.h',
             'animation/AnimationHelpers.h',
             'animation/AnimationPlayer.cpp',
             'animation/AnimationPlayer.h',
             'animation/AnimationNode.cpp',
             'animation/AnimationNode.h',
@@ skipping 2681 matching lines @@
             'testing/MallocStatistics.h',
             'testing/MockPagePopupDriver.cpp',
             'testing/MockPagePopupDriver.h',
             'testing/NullExecutionContext.cpp',
             'testing/NullExecutionContext.h',
             'testing/TypeConversions.h',
             'testing/v8/WebCoreTestSupport.cpp',
             'testing/v8/WebCoreTestSupport.h',
         ],
         'core_unittest_files': [
-            'animation/AnimatableColorTest.cpp',
-            'animation/AnimatableDoubleTest.cpp',
-            'animation/AnimatableLengthTest.cpp',
-            'animation/AnimatableNeutralTest.cpp',
-            'animation/AnimatableStrokeDasharrayListTest.cpp',
-            'animation/AnimatableUnknownTest.cpp',
-            'animation/AnimatableValueTestHelper.cpp',
-            'animation/AnimatableValueTestHelper.h',
-            'animation/AnimatableValueTestHelperTest.cpp',
+            'animation/animatable/AnimatableColorTest.cpp',
+            'animation/animatable/AnimatableDoubleTest.cpp',
+            'animation/animatable/AnimatableLengthTest.cpp',
+            'animation/animatable/AnimatableNeutralTest.cpp',
+            'animation/animatable/AnimatableStrokeDasharrayListTest.cpp',
+            'animation/animatable/AnimatableUnknownTest.cpp',
+            'animation/animatable/AnimatableValueTestHelper.cpp',
+            'animation/animatable/AnimatableValueTestHelper.h',
+            'animation/animatable/AnimatableValueTestHelperTest.cpp',
             'animation/AnimationClockTest.cpp',
             'animation/AnimationHelpersTest.cpp',
             'animation/AnimationPlayerTest.cpp',
             'animation/AnimationNodeTest.cpp',
             'animation/AnimationStackTest.cpp',
             'animation/AnimationTest.cpp',
             'animation/AnimationTestHelper.cpp',
             'animation/AnimationTestHelper.h',
             'animation/AnimationTimelineTest.cpp',
             'animation/AnimationTranslationUtilTest.cpp',
@@ skipping 60 matching lines @@
             'rendering/RenderOverflowTest.cpp',
             'rendering/RenderTableCellTest.cpp',
             'rendering/RenderTableRowTest.cpp',
             'rendering/shapes/BoxShapeTest.cpp',
             'testing/UnitTestHelpers.cpp',
             'testing/UnitTestHelpers.h',
             'xml/parser/SharedBufferReaderTest.cpp',
         ],
     }
 }