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diff --git a/WebCore/plugins/PluginMainThreadScheduler.h b/WebCore/plugins/PluginMainThreadScheduler.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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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
+ * 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 PluginMainThreadScheduler_h
+#define PluginMainThreadScheduler_h
+
+#include <wtf/Deque.h>
+#include <wtf/HashMap.h>
+#include <wtf/MainThread.h>
+#include <wtf/Threading.h>
+
+typedef struct _NPP NPP_t;
+typedef NPP_t* NPP;
+
+namespace WebCore {
+
+class PluginMainThreadScheduler {
+public:
+    typedef void MainThreadFunction(void*);
+
+    static PluginMainThreadScheduler& scheduler();
+
+    void scheduleCall(NPP, MainThreadFunction*, void* userData);
+
+    void registerPlugin(NPP);
+    void unregisterPlugin(NPP);
+
+private:
+    PluginMainThreadScheduler();
+    void dispatchCalls();
+
+    class Call;
+
+    void dispatchCallsForPlugin(NPP, const Deque<Call>& calls);
+    typedef HashMap<NPP, Deque<Call> > CallQueueMap;
+
+    static void mainThreadCallback(void* context);
+
+    class Call {
+    public:
+        Call(MainThreadFunction* function, void* userData)
+            : m_function(function)
+            , m_userData(userData)
+        {
+        }
+
+        void performCall() const
+        {
+            m_function(m_userData);
+        }
+
+    private:
+        MainThreadFunction* m_function;
+        void* m_userData;
+    };
+
+    bool m_callPending;
+    CallQueueMap m_callQueueMap;
+    Mutex m_queueMutex;
+};
+
+} // namespace WebCore
+
+#endif // PluginMainThreadScheduler_h