Reduce how often LayoutSVGShape::updateShapeFromElement is called

Source/core/svg/SVGElement.h

Index: Source/core/svg/SVGElement.h
diff --git a/Source/core/svg/SVGElement.h b/Source/core/svg/SVGElement.h
index 8604a00c11596253d893eb5d1c62ce319f8041e4..f58aed631a6078ac8e3aeaa570a9a9adf8effb63 100644
--- a/Source/core/svg/SVGElement.h
+++ b/Source/core/svg/SVGElement.h
@@ -144,6 +144,8 @@ public:
 
     void invalidateRelativeLengthClients(SubtreeLayoutScope* = 0);
 
+    virtual bool selfHasRelativeLengths() const { return false; }
+
     void addToPropertyMap(PassRefPtrWillBeRawPtr<SVGAnimatedPropertyBase>);
 
     SVGAnimatedString* className() { return m_className.get(); }
@@ -205,8 +207,6 @@ protected:
     void updateRelativeLengthsInformation(bool hasRelativeLengths, SVGElement*);
     static void markForLayoutAndParentResourceInvalidation(LayoutObject*);
 
-    virtual bool selfHasRelativeLengths() const { return false; }
-
     SVGElementRareData* ensureSVGRareData();
     inline bool hasSVGRareData() const { return m_SVGRareData; }
     inline SVGElementRareData* svgRareData() const