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diff --git a/WebCore/storage/IDBFactoryBackendInterface.h b/WebCore/storage/IDBFactoryBackendInterface.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 IDBFactoryBackendInterface_h
+#define IDBFactoryBackendInterface_h
+
+#include "ExceptionCode.h"
+#include "IDBCallbacks.h"
+#include "PlatformString.h"
+#include <wtf/Threading.h>
+
+#if ENABLE(INDEXED_DATABASE)
+
+namespace WebCore {
+
+class Frame;
+class IDBDatabase;
+class SecurityOrigin;
+
+// This class is shared by IDBFactory (async) and IDBFactorySync (sync).
+// This is implemented by IDBFactoryBackendImpl and optionally others (in order to proxy
+// calls across process barriers). All calls to these classes should be non-blocking and
+// trigger work on a background thread if necessary.
+class IDBFactoryBackendInterface : public ThreadSafeShared<IDBFactoryBackendInterface> {
+public:
+    static PassRefPtr<IDBFactoryBackendInterface> create();
+    virtual ~IDBFactoryBackendInterface() { }
+
+    virtual void open(const String& name, const String& description, PassRefPtr<IDBCallbacks>, PassRefPtr<SecurityOrigin>, Frame*) = 0;
+};
+
+} // namespace WebCore
+
+#endif
+
+#endif // IDBFactoryBackendInterface_h
+