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diff --git a/Source/WebCore/editing/DOMTransactionStep.h b/Source/WebCore/editing/DOMTransactionStep.h
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+++ b/Source/WebCore/editing/DOMTransactionStep.h
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+/*
+ * Copyright (C) 2012 Google Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1.  Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2.  Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY GOOGLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL GOOGLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef DOMTransactionStep_h
+#define DOMTransactionStep_h
+
+#if ENABLE(UNDO_MANAGER)
+
+#include "PlatformString.h"
+#include "QualifiedName.h"
+#include <wtf/PassRefPtr.h>
+#include <wtf/RefCounted.h>
+#include <wtf/RefPtr.h>
+#include <wtf/text/WTFString.h>
+
+namespace WebCore {
+
+class CharacterData;
+class Element;
+class Node;
+
+class DOMTransactionStep : public RefCounted<DOMTransactionStep> {
+public:
+    virtual ~DOMTransactionStep() { }
+
+    virtual void unapply() = 0;
+    virtual void reapply() = 0;
+};
+
+class NodeInsertingDOMTransactionStep : public DOMTransactionStep {
+public:
+    static PassRefPtr<NodeInsertingDOMTransactionStep> create(Node*, Node* child);
+    virtual void unapply() OVERRIDE;
+    virtual void reapply() OVERRIDE;
+
+private:
+    NodeInsertingDOMTransactionStep(Node*, Node* child);
+    
+    RefPtr<Node> m_node;
+    RefPtr<Node> m_refChild;
+    RefPtr<Node> m_child;
+};
+
+class NodeRemovingDOMTransactionStep : public DOMTransactionStep {
+public:
+    static PassRefPtr<NodeRemovingDOMTransactionStep> create(Node*, Node* child);
+    virtual void unapply() OVERRIDE;
+    virtual void reapply() OVERRIDE;
+    
+private:
+    NodeRemovingDOMTransactionStep(Node*, Node* child);
+    
+    RefPtr<Node> m_node;
+    RefPtr<Node> m_refChild;
+    RefPtr<Node> m_child;
+};
+
+class DataReplacingDOMTransactionStep : public DOMTransactionStep {
+public:
+    static PassRefPtr<DataReplacingDOMTransactionStep> create(CharacterData*, unsigned offset, unsigned count, const String& data, const String& replacedData);
+    virtual void unapply() OVERRIDE;
+    virtual void reapply() OVERRIDE;
+    
+private:
+    DataReplacingDOMTransactionStep(CharacterData*, unsigned offset, unsigned count, const String& data, const String& replacedData);
+    
+    RefPtr<CharacterData> m_node;
+    unsigned m_offset;
+    unsigned m_count;
+    String m_data;
+    String m_replacedData;
+};
+
+class AttrChangingDOMTransactionStep : public DOMTransactionStep {
+public:
+    static PassRefPtr<AttrChangingDOMTransactionStep> create(Element*, const QualifiedName&, const AtomicString& oldValue, const AtomicString& newValue);
+    virtual void unapply() OVERRIDE;
+    virtual void reapply() OVERRIDE;
+    
+private:
+    AttrChangingDOMTransactionStep(Element*, const QualifiedName&, const AtomicString& oldValue, const AtomicString& newValue);
+    
+    RefPtr<Element> m_element;
+    QualifiedName m_name;
+    AtomicString m_oldValue;
+    AtomicString m_newValue;
+};
+
+}
+
+#endif
+
+#endif