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diff --git a/Source/WebCore/storage/OriginUsageRecord.h b/Source/WebCore/storage/OriginUsageRecord.h
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+++ b/Source/WebCore/storage/OriginUsageRecord.h
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+/*
+ * Copyright (C) 2008 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.
+ * 3.  Neither the name of Apple Computer, Inc. ("Apple") 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 APPLE 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 APPLE 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 OriginUsageRecord_h
+#define OriginUsageRecord_h
+
+#if ENABLE(DATABASE)
+
+#include "PlatformString.h"
+#include <wtf/HashMap.h>
+#include <wtf/HashSet.h> 
+#include <wtf/text/StringHash.h>
+
+namespace WebCore {
+
+// Objects of this class can be used from multiple threads with external synchronization.
+// String arguments are also supposed to be deeply copied by the caller when necessary.
+class OriginUsageRecord : public Noncopyable {
+public:
+    OriginUsageRecord();
+
+    void addDatabase(const String& identifier, const String& fullPath);
+    void removeDatabase(const String& identifier);
+    void markDatabase(const String& identifier); // Size may have changed, and will need to be recalculated.
+    unsigned long long diskUsage();
+
+private:
+    struct DatabaseEntry {
+        DatabaseEntry() { }
+        DatabaseEntry(const String& filename) : filename(filename) { }
+        DatabaseEntry(const String& filename, unsigned long long size) : filename(filename), size(size) { }
+        String filename;
+        unsigned long long size; // This member remains uninitialized until disk usage is calculated.
+    };
+    HashMap<String, DatabaseEntry> m_databaseMap;
+    HashSet<String> m_unknownSet;
+
+    unsigned long long m_cachedDiskUsage;
+    bool m_cachedDiskUsageIsValid;
+};
+
+} // namespace WebCore
+
+#endif
+
+#endif