--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WebCore/bindings/v8/SharedPersistent.h	Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,77 @@
+/*
+ * Copyright (C) 2009 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:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * 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.
+ *     * Neither the name of Google Inc. 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 THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
+ * OWNER 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.
+ */
+
+#ifndef SharedPersistent_h
+#define SharedPersistent_h
+
+#include <v8.h>
+#include <wtf/PassRefPtr.h>
+#include <wtf/RefCounted.h>
+
+namespace WebCore {
+
+    // A shareable reference to a v8 persistent handle.  Using a shared
+    // persistent any number of objects can share a reference to a v8
+    // object and when it should no longer be accessible the object's
+    // owner can clear it.
+    template <typename T>
+    class SharedPersistent : public RefCounted<SharedPersistent<T> > {
+    public:
+        void set(v8::Persistent<T> value)
+        {
+            m_value = value;
+        }
+        v8::Persistent<T> get()
+        {
+            return m_value;
+        }
+        void disposeHandle()
+        {
+            if (!m_value.IsEmpty()) {
+              m_value.Dispose();
+              m_value.Clear();
+            }
+        }
+        static PassRefPtr<SharedPersistent<T> > create(v8::Persistent<T> value)
+        {
+            return adoptRef(new SharedPersistent<T>(value));
+        }
+        static PassRefPtr<SharedPersistent<T> > create()
+        {
+            return create(v8::Persistent<T>());
+        }
+    private:
+        explicit SharedPersistent(v8::Persistent<T> value) : m_value(value) { }
+        v8::Persistent<T> m_value;
+    };
+
+} // namespace WebCore
+
+#endif // SharedPersistent_h