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diff --git a/Source/WebCore/loader/FrameLoaderStateMachine.h b/Source/WebCore/loader/FrameLoaderStateMachine.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 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 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 FrameLoaderStateMachine_h
+#define FrameLoaderStateMachine_h
+
+#include <wtf/Noncopyable.h>
+
+namespace WebCore {
+
+// Encapsulates a state machine for FrameLoader. Note that this is different from FrameState,
+// which stores the state of the current load that FrameLoader is executing.
+class FrameLoaderStateMachine {
+    WTF_MAKE_NONCOPYABLE(FrameLoaderStateMachine);
+public:
+    FrameLoaderStateMachine();
+
+    // Once a load has been committed, the state may
+    // alternate between CommittedFirstRealLoad and FirstLayoutDone.
+    // Otherwise, the states only go down the list.
+    enum State {
+        Uninitialized,
+        CreatingInitialEmptyDocument,
+        DisplayingInitialEmptyDocument,
+        DisplayingInitialEmptyDocumentPostCommit,
+        CommittedFirstRealLoad,
+        FirstLayoutDone
+    };
+
+    bool committingFirstRealLoad() const;
+    bool committedFirstRealDocumentLoad() const;
+    bool creatingInitialEmptyDocument() const;
+    bool isDisplayingInitialEmptyDocument() const;
+    bool firstLayoutDone() const;
+    void advanceTo(State);
+
+private:
+    State m_state;
+};
+
+} // namespace WebCore
+
+#endif // FrameLoaderStateMachine_h