[SVG] Resources should be laid out in dependecy order.

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 1f22c61a0fe968cdd84dad387f2765d43867d6ff..6483b06cf0aa8d218563130a6fd1650b4b2c8947 100644
--- a/Source/core/svg/SVGElement.h
+++ b/Source/core/svg/SVGElement.h
@@ -37,6 +37,7 @@ namespace WebCore {
 class AffineTransform;
 class CSSCursorImageValue;
 class Document;
+class SubtreeLayoutScope;
 class SVGAttributeToPropertyMap;
 class SVGCursorElement;
 class SVGDocumentExtensions;
@@ -133,6 +134,8 @@ public:
 
     virtual bool shouldMoveToFlowThread(RenderStyle*) const OVERRIDE;
 
+    void invalidateRelativeLengthClients(SubtreeLayoutScope* = 0);
+
 protected:
     SVGElement(const QualifiedName&, Document&, ConstructionType = CreateSVGElement);