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diff --git a/Source/WebCore/storage/StorageTracker.h b/Source/WebCore/storage/StorageTracker.h
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+/*
+ * Copyright (C) 2011 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. 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 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 StorageTracker_h
+#define StorageTracker_h
+
+#if ENABLE(DOM_STORAGE)
+    
+#include "PlatformString.h"
+#include "SQLiteDatabase.h"
+#include <wtf/HashSet.h>
+#include <wtf/OwnPtr.h>
+#include <wtf/Vector.h>
+#include <wtf/text/StringHash.h>
+
+namespace WebCore {
+
+class LocalStorageTask;
+class LocalStorageThread;
+class SecurityOrigin;
+class StorageTrackerClient;    
+
+class StorageTracker {
+    WTF_MAKE_NONCOPYABLE(StorageTracker);
+    WTF_MAKE_FAST_ALLOCATED;
+public:
+    static void initializeTracker(const String& storagePath);
+    static StorageTracker& tracker();
+    static void scheduleTask(void*);
+
+    void importOriginIdentifiers();
+    void setOriginDetails(const String& originIdentifier, const String& databaseFile);
+    
+    void deleteAllOrigins();
+    void deleteOrigin(SecurityOrigin*);
+    void deleteOrigin(const String& originIdentifier);
+    void origins(Vector<RefPtr<SecurityOrigin> >& result);
+
+    void cancelDeletingOrigin(const String& originIdentifier);
+    
+    void setClient(StorageTrackerClient*);
+    
+    bool isActive();
+
+    // Sync to disk on background thread.
+    void syncDeleteAllOrigins();
+    void syncDeleteOrigin(const String& originIdentifier);
+    void syncSetOriginDetails(const String& originIdentifier, const String& databaseFile);
+    void syncImportOriginIdentifiers();
+    void syncFileSystemAndTrackerDatabase();
+
+    void syncLocalStorage();
+
+private:
+    StorageTracker(const String& storagePath);
+
+    String trackerDatabasePath();
+    void openTrackerDatabase(bool createIfDoesNotExist);
+
+    void setStorageDirectoryPath(const String&);
+
+    void deleteTrackerFiles();
+
+    bool canDeleteOrigin(const String& originIdentifier);
+    void willDeleteOrigin(const String& originIdentifier);
+    void willDeleteAllOrigins();
+
+    void originFilePaths(Vector<String>& paths);
+    
+    void setIsActive(bool);
+
+    // Guard for m_database, m_storageDirectoryPath and static Strings in syncFileSystemAndTrackerDatabase().
+    Mutex m_databaseGuard;
+    SQLiteDatabase m_database;
+    String m_storageDirectoryPath;
+
+    Mutex m_clientGuard;
+    StorageTrackerClient* m_client;
+
+    // Guard for m_originSet and m_originsBeingDeleted.
+    Mutex m_originSetGuard;
+    typedef HashSet<String> OriginSet;
+    OriginSet m_originSet;
+    OriginSet m_originsBeingDeleted;
+
+    OwnPtr<LocalStorageThread> m_thread;
+    
+    bool m_isActive;
+};
+    
+} // namespace WebCore
+
+#endif // ENABLE(DOM_STORAGE)
+
+#endif // StorageTracker_h