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diff --git a/Source/WebKit2/UIProcess/ChunkedUpdateDrawingAreaProxy.h b/Source/WebKit2/UIProcess/ChunkedUpdateDrawingAreaProxy.h
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+++ b/Source/WebKit2/UIProcess/ChunkedUpdateDrawingAreaProxy.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 DrawingAreaProxyUpdateChunk_h
+#define DrawingAreaProxyUpdateChunk_h
+
+#include "DrawingAreaProxy.h"
+#include <WebCore/IntSize.h>
+
+#if PLATFORM(MAC)
+#include <wtf/RetainPtr.h>
+#ifdef __OBJC__
+@class WKView;
+#else
+class WKView;
+#endif
+#elif PLATFORM(QT)
+#include <QImage>
+class QGraphicsWKView;
+#endif
+
+namespace WebKit {
+
+class UpdateChunk;
+class WebPageProxy;
+
+#if PLATFORM(MAC)
+typedef WKView PlatformWebView;
+#elif PLATFORM(WIN)
+class WebView;
+typedef WebView PlatformWebView;
+#elif PLATFORM(QT)
+typedef QGraphicsWKView PlatformWebView;
+#endif
+
+class ChunkedUpdateDrawingAreaProxy : public DrawingAreaProxy {
+public:
+    static PassOwnPtr<ChunkedUpdateDrawingAreaProxy> create(PlatformWebView*, WebPageProxy*);
+
+    virtual ~ChunkedUpdateDrawingAreaProxy();
+
+private:
+    ChunkedUpdateDrawingAreaProxy(PlatformWebView*, WebPageProxy*);
+
+    WebPageProxy* page();
+
+    // DrawingAreaProxy
+    virtual void didReceiveMessage(CoreIPC::Connection*, CoreIPC::MessageID, CoreIPC::ArgumentDecoder*);
+    virtual bool paint(const WebCore::IntRect&, PlatformDrawingContext);
+    virtual void sizeDidChange();
+    virtual void setPageIsVisible(bool isVisible);
+    
+    void ensureBackingStore();
+    void invalidateBackingStore();
+    bool platformPaint(const WebCore::IntRect&, PlatformDrawingContext);
+    void drawUpdateChunkIntoBackingStore(UpdateChunk*);
+    void didSetSize(UpdateChunk*);
+    void update(UpdateChunk*);
+
+    void sendSetSize();
+
+#if USE(ACCELERATED_COMPOSITING)
+    virtual void attachCompositingContext(uint32_t) { }
+    virtual void detachCompositingContext() { }
+#endif
+
+    bool m_isWaitingForDidSetFrameNotification;
+    bool m_isVisible;
+    bool m_forceRepaintWhenResumingPainting;
+
+#if PLATFORM(MAC)
+    // BackingStore
+    RetainPtr<CGContextRef> m_bitmapContext;
+#elif PLATFORM(WIN)
+    // BackingStore
+    OwnPtr<HDC> m_backingStoreDC;
+    OwnPtr<HBITMAP> m_backingStoreBitmap;
+#elif PLATFORM(QT)
+    QImage m_backingStoreImage;
+#endif
+
+    PlatformWebView* m_webView;
+};
+    
+} // namespace WebKit
+
+#endif // DrawingAreaProxyUpdateChunk_h