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diff --git a/Source/WebCore/Modules/indexeddb/server/MemoryIndex.h b/Source/WebCore/Modules/indexeddb/server/MemoryIndex.h
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+++ b/Source/WebCore/Modules/indexeddb/server/MemoryIndex.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 "IDBIndexInfo.h"
+#include "IDBResourceIdentifier.h"
+#include <wtf/HashMap.h>
+#include <wtf/HashSet.h>
+
+namespace WebCore {
+
+class IDBCursorInfo;
+class IDBError;
+class IDBGetAllResult;
+class IDBGetResult;
+class IDBKeyData;
+class IndexKey;
+class ThreadSafeDataBuffer;
+
+struct IDBKeyRangeData;
+
+namespace IndexedDB {
+enum class GetAllType;
+enum class IndexRecordType;
+}
+
+namespace IDBServer {
+
+class IndexValueStore;
+class MemoryBackingStoreTransaction;
+class MemoryIndexCursor;
+class MemoryObjectStore;
+
+class MemoryIndex : public RefCounted<MemoryIndex> {
+public:
+    static Ref<MemoryIndex> create(const IDBIndexInfo&, MemoryObjectStore&);
+
+    ~MemoryIndex();
+
+    const IDBIndexInfo& info() const { return m_info; }
+
+    void rename(const String& newName) { m_info.rename(newName); }
+
+    IDBGetResult getResultForKeyRange(IndexedDB::IndexRecordType, const IDBKeyRangeData&) const;
+    uint64_t countForKeyRange(const IDBKeyRangeData&);
+    void getAllRecords(const IDBKeyRangeData&, std::optional<uint32_t> count, IndexedDB::GetAllType, IDBGetAllResult&) const;
+
+    IDBError putIndexKey(const IDBKeyData&, const IndexKey&);
+
+    void removeEntriesWithValueKey(const IDBKeyData&);
+    void removeRecord(const IDBKeyData&, const IndexKey&);
+
+    void objectStoreCleared();
+    void clearIndexValueStore();
+    void replaceIndexValueStore(std::unique_ptr<IndexValueStore>&&);
+
+    MemoryIndexCursor* maybeOpenCursor(const IDBCursorInfo&);
+
+    IndexValueStore* valueStore() { return m_records.get(); }
+
+    MemoryObjectStore& objectStore() { return m_objectStore; }
+
+    void cursorDidBecomeClean(MemoryIndexCursor&);
+    void cursorDidBecomeDirty(MemoryIndexCursor&);
+
+    void notifyCursorsOfValueChange(const IDBKeyData& indexKey, const IDBKeyData& primaryKey);
+
+private:
+    MemoryIndex(const IDBIndexInfo&, MemoryObjectStore&);
+
+    uint64_t recordCountForKey(const IDBKeyData&) const;
+
+    void notifyCursorsOfAllRecordsChanged();
+
+    IDBIndexInfo m_info;
+    MemoryObjectStore& m_objectStore;
+
+    std::unique_ptr<IndexValueStore> m_records;
+
+    HashMap<IDBResourceIdentifier, std::unique_ptr<MemoryIndexCursor>> m_cursors;
+    HashSet<MemoryIndexCursor*> m_cleanCursors;
+};
+
+} // namespace IDBServer
+} // namespace WebCore
+
+#endif // ENABLE(INDEXED_DATABASE)