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diff --git a/Source/WebCore/Modules/indexeddb/server/IndexValueEntry.h b/Source/WebCore/Modules/indexeddb/server/IndexValueEntry.h
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+++ b/Source/WebCore/Modules/indexeddb/server/IndexValueEntry.h
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+/*
+ * Copyright (C) 2015 Apple 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 APPLE INC. ``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 APPLE INC. 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.
+ */
+
+#pragma once
+
+#if ENABLE(INDEXED_DATABASE)
+
+#include "IDBKeyData.h"
+#include <set>
+
+namespace WebCore {
+
+class ThreadSafeDataBuffer;
+
+enum class CursorDuplicity;
+
+namespace IDBServer {
+
+class IndexValueEntry {
+public:
+    IndexValueEntry(bool unique);
+    ~IndexValueEntry();
+
+    void addKey(const IDBKeyData&);
+
+    // Returns true if a key was actually removed.
+    bool removeKey(const IDBKeyData&);
+
+    const IDBKeyData* getLowest() const;
+
+    uint64_t getCount() const;
+
+    class Iterator {
+    public:
+        Iterator()
+        {
+        }
+
+        Iterator(IndexValueEntry&);
+        Iterator(IndexValueEntry&, std::set<IDBKeyData>::iterator);
+        Iterator(IndexValueEntry&, std::set<IDBKeyData>::reverse_iterator);
+
+        bool isValid() const;
+        void invalidate();
+
+        const IDBKeyData& key() const;
+        const ThreadSafeDataBuffer& value() const;
+
+        Iterator& operator++();
+
+    private:
+        IndexValueEntry* m_entry { nullptr };
+        bool m_forward { true };
+        std::set<IDBKeyData>::iterator m_forwardIterator;
+        std::set<IDBKeyData>::reverse_iterator m_reverseIterator;
+    };
+
+    Iterator begin();
+    Iterator reverseBegin(CursorDuplicity);
+
+    // Finds the key, or the next higher record after the key.
+    Iterator find(const IDBKeyData&);
+    // Finds the key, or the next lowest record before the key.
+    Iterator reverseFind(const IDBKeyData&, CursorDuplicity);
+
+    bool unique() const { return m_unique; }
+
+private:
+    union {
+        std::set<IDBKeyData>* m_orderedKeys;
+        IDBKeyData* m_key;
+    };
+
+    bool m_unique;
+};
+
+} // namespace IDBServer
+} // namespace WebCore
+
+#endif // ENABLE(INDEXED_DATABASE)