Move supplemental transform to rare data

Source/core/svg/SVGElementRareData.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "core/svg/SVGElementRareData.h"
 
 #include "core/css/CSSCursorImageValue.h"
 #include "core/css/resolver/StyleResolver.h"
 #include "core/dom/Document.h"
 #include "core/svg/SVGCursorElement.h"
+#include "platform/transforms/AffineTransform.h"
 
 namespace blink {
 
 MutableStylePropertySet* SVGElementRareData::ensureAnimatedSMILStyleProperties()
 {
     if (!m_animatedSMILStyleProperties)
         m_animatedSMILStyleProperties = MutableStylePropertySet::create(SVGAttributeMode);
     return m_animatedSMILStyleProperties.get();
 }
 
@@ skipping 38 matching lines @@
                 m_cursorElement->removeReferencedElement(m_owner);
                 m_cursorElement = nullptr;
             }
             m_cursorImageValue = nullptr;
         }
         ASSERT(!m_cursorElement || visitor->isAlive(m_cursorElement));
         ASSERT(!m_cursorImageValue || visitor->isAlive(m_cursorImageValue));
 #endif
 }
 
+AffineTransform* SVGElementRareData::animateMotionTransform()
+{
+    if (!m_animateMotionTransform)
+        m_animateMotionTransform = adoptPtr(new AffineTransform);
+    return m_animateMotionTransform.get();
+}
 
 }