Move common gradient attribute collection to SVGGradientElement

third_party/WebKit/Source/core/svg/SVGGradientElement.h

Index: third_party/WebKit/Source/core/svg/SVGGradientElement.h
diff --git a/third_party/WebKit/Source/core/svg/SVGGradientElement.h b/third_party/WebKit/Source/core/svg/SVGGradientElement.h
index f7c24e2d47f72ee28438601670c6fc99fd0763d9..ed58079295e327234a36f8b0bc37f1e4fef8e236 100644
--- a/third_party/WebKit/Source/core/svg/SVGGradientElement.h
+++ b/third_party/WebKit/Source/core/svg/SVGGradientElement.h
@@ -32,6 +32,8 @@
 
 namespace blink {
 
+struct GradientAttributes;
+
 enum SVGSpreadMethodType {
   SVGSpreadMethodUnknown = 0,
   SVGSpreadMethodPad,
@@ -47,23 +49,26 @@ class SVGGradientElement : public SVGElement, public SVGURIReference {
   USING_GARBAGE_COLLECTED_MIXIN(SVGGradientElement);
 
  public:
-  Vector<Gradient::ColorStop> buildStops();
-
-  SVGAnimatedTransformList* gradientTransform() {
+  SVGAnimatedTransformList* gradientTransform() const {
     return m_gradientTransform.get();
   }
-  SVGAnimatedEnumeration<SVGSpreadMethodType>* spreadMethod() {
+  SVGAnimatedEnumeration<SVGSpreadMethodType>* spreadMethod() const {
     return m_spreadMethod.get();
   }
-  SVGAnimatedEnumeration<SVGUnitTypes::SVGUnitType>* gradientUnits() {
+  SVGAnimatedEnumeration<SVGUnitTypes::SVGUnitType>* gradientUnits() const {
     return m_gradientUnits.get();
   }
 
+  const SVGGradientElement* referencedElement() const;
+  void collectCommonAttributes(GradientAttributes&) const;
+
   DECLARE_VIRTUAL_TRACE();
 
  protected:
   SVGGradientElement(const QualifiedName&, Document&);
 
+  using VisitedSet = HeapHashSet<Member<const SVGGradientElement>>;
+
   void svgAttributeChanged(const QualifiedName&) override;
 
  private:
@@ -75,6 +80,8 @@ class SVGGradientElement : public SVGElement, public SVGURIReference {
 
   void childrenChanged(const ChildrenChange&) final;
 
+  Vector<Gradient::ColorStop> buildStops() const;
+
   Member<SVGAnimatedTransformList> m_gradientTransform;
   Member<SVGAnimatedEnumeration<SVGSpreadMethodType>> m_spreadMethod;
   Member<SVGAnimatedEnumeration<SVGUnitTypes::SVGUnitType>> m_gradientUnits;