Make SVGResourcesCycleSolver check for cycles beyond one level (and more)

Source/core/rendering/svg/SVGResourcesCycleSolver.h

Index: Source/core/rendering/svg/SVGResourcesCycleSolver.h
diff --git a/Source/core/rendering/svg/SVGResourcesCycleSolver.h b/Source/core/rendering/svg/SVGResourcesCycleSolver.h
index cadaa5a311ebaf08515a0b6995f38c1551bdb88b..aadd9f6fa5438fa36348fe192e58995687ca82e6 100644
--- a/Source/core/rendering/svg/SVGResourcesCycleSolver.h
+++ b/Source/core/rendering/svg/SVGResourcesCycleSolver.h
@@ -37,13 +37,17 @@ public:
 
     void resolveCycles();
 
+    typedef HashSet<RenderSVGResourceContainer*> ResourceSet;
+
 private:
-    bool resourceContainsCycles(RenderObject*) const;
+    bool resourceContainsCycles(RenderSVGResourceContainer*);
     void breakCycle(RenderSVGResourceContainer*);
 
     RenderObject* m_renderer;
     SVGResources* m_resources;
-    HashSet<RenderSVGResourceContainer*> m_allResources;
+
+    ResourceSet m_activeResources;
+    ResourceSet m_dagCache;
 };
 
 }