Move resourceType() method to RenderSVGResourceContainer

Source/core/rendering/svg/RenderSVGResourceContainer.h

Index: Source/core/rendering/svg/RenderSVGResourceContainer.h
diff --git a/Source/core/rendering/svg/RenderSVGResourceContainer.h b/Source/core/rendering/svg/RenderSVGResourceContainer.h
index 780f503e9cdf7776016433028aaaeef4372f5099..dc4a602a99ff03f73ff178fd50af9c7c49fbc6bc 100644
--- a/Source/core/rendering/svg/RenderSVGResourceContainer.h
+++ b/Source/core/rendering/svg/RenderSVGResourceContainer.h
@@ -26,6 +26,16 @@
 
 namespace blink {
 
+enum RenderSVGResourceType {
+    MaskerResourceType,
+    MarkerResourceType,
+    PatternResourceType,
+    LinearGradientResourceType,
+    RadialGradientResourceType,
+    FilterResourceType,
+    ClipperResourceType
+};
+
 class RenderLayer;
 
 class RenderSVGResourceContainer : public RenderSVGHiddenContainer,
@@ -41,6 +51,8 @@ public:
     virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle) override final;
     virtual bool isOfType(RenderObjectType type) const override { return type == RenderObjectSVGResourceContainer || RenderSVGHiddenContainer::isOfType(type); }
 
+    virtual RenderSVGResourceType resourceType() const = 0;
+
     void idChanged();
     void addClientRenderLayer(Node*);
     void addClientRenderLayer(RenderLayer*);
@@ -109,6 +121,9 @@ Renderer* getRenderSVGResourceById(TreeScope& treeScope, const AtomicString& id)
 
 DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderSVGResourceContainer, isSVGResourceContainer());
 
+#define DEFINE_RENDER_SVG_RESOURCE_TYPE_CASTS(thisType, typeName) \
+    DEFINE_TYPE_CASTS(thisType, RenderSVGResourceContainer, resource, resource->resourceType() == typeName, resource.resourceType() == typeName)
+
 }
 
 #endif