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diff --git a/Source/WebKit2/WebProcess/WebPage/TiledDrawingArea.h b/Source/WebKit2/WebProcess/WebPage/TiledDrawingArea.h
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+/*
+ * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
+ *
+ * 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 TiledDrawingArea_h
+#define TiledDrawingArea_h
+
+#if ENABLE(TILED_BACKING_STORE)
+
+#include "DrawingArea.h"
+#include "RunLoop.h"
+#include <WebCore/IntPoint.h>
+#include <WebCore/IntRect.h>
+#include <wtf/Vector.h>
+
+namespace WebKit {
+
+class UpdateChunk;
+
+class TiledDrawingArea : public DrawingArea {
+public:
+    TiledDrawingArea(DrawingAreaInfo::Identifier, WebPage*);
+    virtual ~TiledDrawingArea();
+
+    virtual void setNeedsDisplay(const WebCore::IntRect&);
+    virtual void scroll(const WebCore::IntRect& scrollRect, const WebCore::IntSize& scrollDelta);
+    virtual void display();
+
+#if USE(ACCELERATED_COMPOSITING)
+    virtual void attachCompositingContext() { }
+    virtual void detachCompositingContext() { }
+    virtual void setRootCompositingLayer(WebCore::GraphicsLayer*) { }
+    virtual void scheduleCompositingLayerSync() { }
+    virtual void syncCompositingLayers() { }
+#endif
+
+    virtual void didReceiveMessage(CoreIPC::Connection*, CoreIPC::MessageID, CoreIPC::ArgumentDecoder*);
+
+private:
+    void scheduleDisplay();
+
+    // CoreIPC message handlers.
+    void setSize(const WebCore::IntSize& viewSize);
+    void suspendPainting();
+    void resumePainting();
+    void didUpdate();
+    void updateTile(int tileID, const WebCore::IntRect& dirtyRect, float scale);
+
+    // Platform overrides
+    void paintIntoUpdateChunk(UpdateChunk*, float scale);
+
+    void tileUpdateTimerFired();
+
+    WebCore::IntRect m_dirtyRect;
+    bool m_isWaitingForUpdate;
+    bool m_shouldPaint;
+    RunLoop::Timer<TiledDrawingArea> m_displayTimer;
+
+    struct TileUpdate {
+        int tileID;
+        WebCore::IntRect dirtyRect;
+        float scale;
+    };
+    typedef HashMap<int, TileUpdate> UpdateMap;
+    UpdateMap m_pendingUpdates;
+    RunLoop::Timer<TiledDrawingArea> m_tileUpdateTimer;
+};
+
+} // namespace WebKit
+
+#endif // TILED_BACKING_STORE
+
+#endif // TiledDrawingArea_h