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diff --git a/Source/WebCore/bindings/v8/RetainedDOMInfo.cpp b/Source/WebCore/bindings/v8/RetainedDOMInfo.cpp
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+++ b/Source/WebCore/bindings/v8/RetainedDOMInfo.cpp
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+/*
+ * Copyright (C) 2011 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:
+ * 
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * 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.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
+ * OWNER OR 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.
+ */
+
+#include "config.h"
+#include "RetainedDOMInfo.h"
+
+#include "Node.h"
+
+namespace WebCore {
+
+RetainedDOMInfo::RetainedDOMInfo(Node* root)
+    : m_root(root)
+{
+    ASSERT(m_root);
+}
+
+RetainedDOMInfo::~RetainedDOMInfo()
+{
+}
+
+void RetainedDOMInfo::Dispose()
+{
+    delete this;
+}
+
+bool RetainedDOMInfo::IsEquivalent(v8::RetainedObjectInfo* other)
+{
+    ASSERT(other);
+    return other == this || static_cast<WebCore::RetainedObjectInfo*>(other)->GetEquivalenceClass() == this->GetEquivalenceClass();
+}
+
+intptr_t RetainedDOMInfo::GetHash()
+{
+    return reinterpret_cast<intptr_t>(m_root);
+}
+    
+const char* RetainedDOMInfo::GetLabel()
+{
+    return m_root->inDocument() ? "Document DOM tree" : "Detached DOM tree";
+}
+
+intptr_t RetainedDOMInfo::GetElementCount()
+{
+    intptr_t count = 1;
+    Node* current = m_root;
+    while (current) {
+        current = current->traverseNextNode(m_root);
+        ++count;
+    }
+    return count;
+}
+
+intptr_t RetainedDOMInfo::GetEquivalenceClass()
+{
+    return reinterpret_cast<intptr_t>(m_root);
+}
+
+} // namespace WebCore