Store [-webkit-]transform-origin as a TransformOrigin.

Source/core/animation/css/CSSAnimatableValueFactory.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 127 matching lines @@
         flag);
 }
 
 inline static PassRefPtrWillBeRawPtr<AnimatableValue> createFromLengthPoint(const LengthPoint& lengthPoint, const RenderStyle& style)
 {
     return AnimatableLengthPoint::create(
         createFromLength(lengthPoint.x(), style),
         createFromLength(lengthPoint.y(), style));
 }
 
+inline static PassRefPtrWillBeRawPtr<AnimatableValue> createFromTransformOrigin(const TransformOrigin& transformOrigin, const RenderStyle& style)
+{
+    return AnimatableLengthPoint3D::create(
+        createFromLength(transformOrigin.x(), style),
+        createFromLength(transformOrigin.y(), style),
+        createFromDouble(transformOrigin.z()));
+}
+
 inline static PassRefPtrWillBeRawPtr<AnimatableValue> createFromLengthSize(const LengthSize& lengthSize, const RenderStyle& style)
 {
     return AnimatableLengthSize::create(
         createFromLength(lengthSize.width(), style),
         createFromLength(lengthSize.height(), style));
 }
 
 inline static PassRefPtrWillBeRawPtr<AnimatableValue> createFromStyleImage(StyleImage* image)
 {
     if (image) {
@@ skipping 318 matching lines @@
         return createFromShapeValue(style.shapeOutside());
     case CSSPropertyShapeMargin:
         return createFromLength(style.shapeMargin(), style);
     case CSSPropertyShapeImageThreshold:
         return createFromDouble(style.shapeImageThreshold());
     case CSSPropertyWebkitTextStrokeColor:
         return createFromColor(property, style);
     case CSSPropertyTransform:
         return AnimatableTransform::create(style.transform());
     case CSSPropertyTransformOrigin:
-        return AnimatableLengthPoint3D::create(
-            createFromLength(style.transformOriginX(), style),
-            createFromLength(style.transformOriginY(), style),
-            createFromDouble(style.transformOriginZ()));
+        return createFromTransformOrigin(style.transformOrigin(), style);
     case CSSPropertyWidows:
         return createFromDouble(style.widows());
     case CSSPropertyWidth:
         return createFromLength(style.width(), style);
     case CSSPropertyWordSpacing:
         return createFromDouble(style.wordSpacing());
     case CSSPropertyVerticalAlign:
         if (style.verticalAlign() == LENGTH)
             return createFromLength(style.verticalAlignLength(), style);
         return AnimatableUnknown::create(CSSPrimitiveValue::create(style.verticalAlign()));
     case CSSPropertyVisibility:
         return AnimatableVisibility::create(style.visibility());
     case CSSPropertyZIndex:
         return createFromDouble(style.zIndex());
     case CSSPropertyZoom:
         return createFromDouble(style.zoom());
     default:
         ASSERT_NOT_REACHED();
         // This return value is to avoid a release crash if possible.
         return AnimatableUnknown::create(nullptr);
     }
 }
 
 } // namespace blink