Move InvalidationGuard/InstanceUpdateBlocker out of SVGElementInstance

Source/core/svg/SVGElement.h

 /*
  * Copyright (C) 2004, 2005, 2006, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006 Rob Buis <buis@kde.org>
  * Copyright (C) 2009 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 137 matching lines @@
 
     bool isContextElement() const { return m_isContextElement; }
     void setContextElement() { m_isContextElement = true; }
 
     void addToPropertyMap(PassRefPtr<SVGAnimatedPropertyBase>);
 
     SVGAnimatedString* className() { return m_className.get(); }
 
     bool inUseShadowTree() const;
 
+    class InstanceInvalidationGuard {

[pdr., 2014/05/05 21:00:15]

I would have left this as InvalidationGuard since the instance concept will be
going away soon.

+        WTF_MAKE_NONCOPYABLE(InstanceInvalidationGuard);
+    public:
+        InstanceInvalidationGuard(SVGElement* element) : m_element(element) { }
+        ~InstanceInvalidationGuard() { SVGElement::invalidateAllInstancesOfElement(m_element); }
+    private:
+        SVGElement* m_element;
+    };
+
+    class InstanceUpdateBlocker {
+        WTF_MAKE_NONCOPYABLE(InstanceUpdateBlocker);
+    public:
+        InstanceUpdateBlocker(SVGElement* targetElement);
+        ~InstanceUpdateBlocker();
+
+    private:
+        SVGElement* m_targetElement;
+    };
+
+    static void invalidateAllInstancesOfElement(SVGElement*);
+
 protected:
     SVGElement(const QualifiedName&, Document&, ConstructionType = CreateSVGElement);
 
     virtual void parseAttribute(const QualifiedName&, const AtomicString&) OVERRIDE;
 
     virtual void finishParsingChildren() OVERRIDE;
     virtual void attributeChanged(const QualifiedName&, const AtomicString&, AttributeModificationReason = ModifiedDirectly) OVERRIDE;
 
     virtual bool isPresentationAttribute(const QualifiedName&) const OVERRIDE;
     virtual void collectStyleForPresentationAttribute(const QualifiedName&, const AtomicString&, MutableStylePropertySet*) OVERRIDE;
@@ skipping 65 matching lines @@
     static bool equal(const QualifiedName& a, const QualifiedName& b) { return a.matches(b); }
 };
 
 DEFINE_ELEMENT_TYPE_CASTS(SVGElement, isSVGElement());
 
 template <> inline bool isElementOfType<const SVGElement>(const Node& node) { return node.isSVGElement(); }
 
 }
 
 #endif