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diff --git a/WebCore/platform/audio/HRTFDatabaseLoader.h b/WebCore/platform/audio/HRTFDatabaseLoader.h
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+++ b/WebCore/platform/audio/HRTFDatabaseLoader.h
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+/*
+ * Copyright (C) 2010 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:
+ *
+ * 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 HRTFDatabaseLoader_h
+#define HRTFDatabaseLoader_h
+
+#include "HRTFDatabase.h"
+#include <wtf/PassRefPtr.h>
+#include <wtf/RefCounted.h>
+#include <wtf/RefPtr.h>
+#include <wtf/Threading.h>
+
+namespace WebCore {
+
+// HRTFDatabaseLoader will asynchronously load the default HRTFDatabase in a new thread.
+
+class HRTFDatabaseLoader : public RefCounted<HRTFDatabaseLoader> {
+public:
+    // Lazily creates the singleton HRTFDatabaseLoader (if not already created) and starts loading asynchronously (when created the first time).
+    // Returns the singleton HRTFDatabaseLoader.
+    // Must be called from the main thread.
+    static PassRefPtr<HRTFDatabaseLoader> createAndLoadAsynchronouslyIfNecessary(double sampleRate);
+
+    // Both constructor and destructor must be called from the main thread.
+    ~HRTFDatabaseLoader();
+    
+    // Returns true once the default database has been completely loaded.
+    bool isLoaded() const;
+    
+    HRTFDatabase* database() { return m_hrtfDatabase.get(); }
+    
+    // Called in asynchronous loading thread.
+    void load();
+
+    // defaultHRTFDatabase() gives access to the loaded database.
+    // This can be called from any thread, but it is the callers responsibilty to call this while the context (and thus HRTFDatabaseLoader)
+    // is still alive.  Otherwise this will return 0.
+    static HRTFDatabase* defaultHRTFDatabase();
+
+private:
+    // Both constructor and destructor must be called from the main thread.
+    explicit HRTFDatabaseLoader(double sampleRate);    
+    
+    // If it hasn't already been loaded, creates a new thread and initiates asynchronous loading of the default database.
+    // This must be called from the main thread.
+    void loadAsynchronously();
+
+    double databaseSampleRate() const { return m_databaseSampleRate; }
+
+    static HRTFDatabaseLoader* s_loader; // singleton
+    OwnPtr<HRTFDatabase> m_hrtfDatabase;
+    ThreadIdentifier m_databaseLoaderThread;
+    bool m_startedLoadingDatabase;
+    double m_databaseSampleRate;    
+};
+
+
+} // namespace WebCore
+
+#endif // HRTFDatabaseLoader_h