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diff --git a/Source/WebCore/svg/SVGDocumentExtensions.h b/Source/WebCore/svg/SVGDocumentExtensions.h
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+++ b/Source/WebCore/svg/SVGDocumentExtensions.h
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+/*
+ * Copyright (C) 2006 Apple Inc. All rights reserved.
+ * Copyright (C) 2006, 2008 Nikolas Zimmermann <zimmermann@kde.org>
+ *
+ * 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.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public License
+ * along with this library; see the file COPYING.LIB.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef SVGDocumentExtensions_h
+#define SVGDocumentExtensions_h
+
+#if ENABLE(SVG)
+#include "SVGResourcesCache.h"
+#include <wtf/Forward.h>
+#include <wtf/HashMap.h>
+#include <wtf/HashSet.h>
+#include <wtf/PassOwnPtr.h>
+#include <wtf/text/AtomicStringHash.h>
+#include <wtf/text/StringImpl.h>
+
+namespace WebCore {
+
+class Document;
+class RenderSVGResourceContainer;
+class SVGStyledElement;
+class SVGSMILElement;
+class SVGSVGElement;
+
+class SVGDocumentExtensions : public Noncopyable {
+public:
+    typedef HashSet<RefPtr<SVGStyledElement> > SVGPendingElements;
+    SVGDocumentExtensions(Document*);
+    ~SVGDocumentExtensions();
+    
+    void addTimeContainer(SVGSVGElement*);
+    void removeTimeContainer(SVGSVGElement*);
+
+    void addResource(const AtomicString& id, RenderSVGResourceContainer*);
+    void removeResource(const AtomicString& id);
+    RenderSVGResourceContainer* resourceById(const AtomicString& id) const;
+
+    void startAnimations();
+    void pauseAnimations();
+    void unpauseAnimations();
+    bool sampleAnimationAtTime(const String& elementId, SVGSMILElement*, double time);
+
+    void reportWarning(const String&);
+    void reportError(const String&);
+
+    SVGResourcesCache* resourcesCache() const { return m_resourcesCache.get(); }
+
+private:
+    Document* m_document; // weak reference
+    HashSet<SVGSVGElement*> m_timeContainers; // For SVG 1.2 support this will need to be made more general.
+    HashMap<AtomicString, RenderSVGResourceContainer*> m_resources;
+    HashMap<AtomicString, SVGPendingElements*> m_pendingResources;
+    OwnPtr<SVGResourcesCache> m_resourcesCache;
+
+    SVGDocumentExtensions(const SVGDocumentExtensions&);
+    SVGDocumentExtensions& operator=(const SVGDocumentExtensions&);
+
+public:
+    // This HashMap contains a list of pending resources. Pending resources, are such
+    // which are referenced by any object in the SVG document, but do NOT exist yet.
+    // For instance, dynamically build gradients / patterns / clippers...
+    void addPendingResource(const AtomicString& id, PassRefPtr<SVGStyledElement>);
+    bool isPendingResource(const AtomicString& id) const;
+    PassOwnPtr<SVGPendingElements> removePendingResource(const AtomicString& id);
+};
+
+}
+
+#endif
+#endif