Move supplemental transform to rare data

Source/core/svg/SVGElementRareData.cpp

Index: Source/core/svg/SVGElementRareData.cpp
diff --git a/Source/core/svg/SVGElementRareData.cpp b/Source/core/svg/SVGElementRareData.cpp
index e95f6e3c85a6570f8fdbaff6100442ca335705f6..2d8afc9dabb3a4747ecc0cb2a93fff79bb8d85bb 100644
--- a/Source/core/svg/SVGElementRareData.cpp
+++ b/Source/core/svg/SVGElementRareData.cpp
@@ -9,6 +9,7 @@
 #include "core/css/resolver/StyleResolver.h"
 #include "core/dom/Document.h"
 #include "core/svg/SVGCursorElement.h"
+#include "platform/transforms/AffineTransform.h"
 
 namespace blink {
 
@@ -67,5 +68,11 @@ void SVGElementRareData::processWeakMembers(Visitor* visitor)
 #endif
 }
 
+AffineTransform* SVGElementRareData::animateMotionTransform()
+{
+    if (!m_animateMotionTransform)
+        m_animateMotionTransform = adoptPtr(new AffineTransform);
+    return m_animateMotionTransform.get();
+}
 
 }