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diff --git a/Source/WebKit2/WebProcess/WebPage/PageOverlay.h b/Source/WebKit2/WebProcess/WebPage/PageOverlay.h
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+++ b/Source/WebKit2/WebProcess/WebPage/PageOverlay.h
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+/*
+ * Copyright (C) 2010 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. 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 INC. 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 PageOverlay_h
+#define PageOverlay_h
+
+#include "APIObject.h"
+#include "RunLoop.h"
+#include <wtf/PassRefPtr.h>
+
+namespace WebCore {
+    class GraphicsContext;
+    class IntRect;
+}
+
+namespace WebKit {
+
+class WebMouseEvent;
+class WebPage;
+
+class PageOverlay : public APIObject {
+public:
+    class Client {
+    protected:
+        virtual ~Client() { }
+    
+    public:
+        virtual void pageOverlayDestroyed(PageOverlay*) = 0;
+        virtual void willMoveToWebPage(PageOverlay*, WebPage*) = 0;
+        virtual void didMoveToWebPage(PageOverlay*, WebPage*) = 0;
+        virtual void drawRect(PageOverlay*, WebCore::GraphicsContext&, const WebCore::IntRect& dirtyRect) = 0;
+        virtual bool mouseEvent(PageOverlay*, const WebMouseEvent&) = 0;
+    };
+
+    static const Type APIType = TypeBundlePageOverlay;
+
+    static PassRefPtr<PageOverlay> create(Client*);
+    virtual ~PageOverlay();
+
+    void setPage(WebPage*);
+    void setNeedsDisplay(const WebCore::IntRect& dirtyRect);
+    void setNeedsDisplay();
+
+    void drawRect(WebCore::GraphicsContext&, const WebCore::IntRect& dirtyRect);
+    bool mouseEvent(const WebMouseEvent&);
+
+    void startFadeInAnimation();
+    void startFadeOutAnimation();
+
+    float fractionFadedIn() const { return m_fractionFadedIn; }
+
+protected:
+    explicit PageOverlay(Client*);
+
+private:
+    // APIObject
+    virtual Type type() const { return APIType; }
+
+    WebCore::IntRect bounds() const;
+
+    void startFadeAnimation();
+    void fadeAnimationTimerFired();
+
+    Client* m_client;
+    WebPage* m_webPage;
+
+    RunLoop::Timer<PageOverlay> m_fadeAnimationTimer;
+    double m_fadeAnimationStartTime;
+    double m_fadeAnimationDuration;
+
+    enum FadeAnimationType {
+        NoAnimation,
+        FadeInAnimation,
+        FadeOutAnimation,
+    };
+
+    FadeAnimationType m_fadeAnimationType;
+    float m_fractionFadedIn;
+};
+
+} // namespace WebKit
+
+#endif // PageOverlay_h