[svg2] Make 'cx', 'cy' and 'r' presentation attributes

Source/core/animation/css/CSSAnimatableValueFactory.cpp

Index: Source/core/animation/css/CSSAnimatableValueFactory.cpp
diff --git a/Source/core/animation/css/CSSAnimatableValueFactory.cpp b/Source/core/animation/css/CSSAnimatableValueFactory.cpp
index b2a6b313875cd3d133ac2b65c8682eb6f4180511..ed46e4f957e7066ad2d9019df52f043f873bae73 100644
--- a/Source/core/animation/css/CSSAnimatableValueFactory.cpp
+++ b/Source/core/animation/css/CSSAnimatableValueFactory.cpp
@@ -528,10 +528,16 @@ PassRefPtrWillBeRawPtr<AnimatableValue> CSSAnimatableValueFactory::create(CSSPro
         return AnimatableUnknown::create(CSSPrimitiveValue::create(style.verticalAlign()));
     case CSSPropertyVisibility:
         return AnimatableVisibility::create(style.visibility());
+    case CSSPropertyCx:
+        return createFromLength(style.svgStyle().cx(), style);
+    case CSSPropertyCy:
+        return createFromLength(style.svgStyle().cy(), style);
     case CSSPropertyX:
         return createFromLength(style.svgStyle().x(), style);
     case CSSPropertyY:
         return createFromLength(style.svgStyle().y(), style);
+    case CSSPropertyR:
+        return createFromLength(style.svgStyle().r(), style);
     case CSSPropertyRx:
         return createFromLength(style.svgStyle().rx(), style);
     case CSSPropertyRy: