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diff --git a/Source/WebKit2/UIProcess/TiledDrawingAreaProxy.h b/Source/WebKit2/UIProcess/TiledDrawingAreaProxy.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 TiledDrawingAreaProxy_h
+#define TiledDrawingAreaProxy_h
+
+#if ENABLE(TILED_BACKING_STORE)
+
+#include "DrawingAreaProxy.h"
+#include <WebCore/GraphicsContext.h>
+#include <WebCore/IntSize.h>
+#include <WebCore/IntRect.h>
+#include <wtf/HashSet.h>
+
+#include "RunLoop.h"
+#include "TiledDrawingAreaTile.h"
+
+#if PLATFORM(MAC)
+#include <wtf/RetainPtr.h>
+#ifdef __OBJC__
+@class WKView;
+#else
+class WKView;
+#endif
+#elif PLATFORM(QT)
+class QGraphicsWKView;
+#include <QImage>
+#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 TiledDrawingAreaProxy : public DrawingAreaProxy {
+public:
+    static PassOwnPtr<TiledDrawingAreaProxy> create(PlatformWebView* webView, WebPageProxy*);
+
+    TiledDrawingAreaProxy(PlatformWebView*, WebPageProxy*);
+    virtual ~TiledDrawingAreaProxy();
+
+    float contentsScale() const { return m_contentsScale; }
+    void setContentsScale(float);
+
+    void waitUntilUpdatesComplete();
+
+    void takeSnapshot(const WebCore::IntSize& size, const WebCore::IntRect& contentsRect);
+
+#if USE(ACCELERATED_COMPOSITING)
+    virtual void attachCompositingContext(uint32_t /* contextID */) { }
+    virtual void detachCompositingContext() { }
+#endif
+
+    void paint(WebCore::GraphicsContext*, const WebCore::IntRect&);
+
+    WebCore::IntSize tileSize() { return m_tileSize; }
+    void setTileSize(const WebCore::IntSize&);
+
+    double tileCreationDelay() const { return m_tileCreationDelay; }
+    void setTileCreationDelay(double delay);
+
+    // Tiled are dropped outside the keep area, and created for cover area. The values a relative to the viewport size.
+    void getKeepAndCoverAreaMultipliers(WebCore::FloatSize& keepMultiplier, WebCore::FloatSize& coverMultiplier)
+    {
+        keepMultiplier = m_keepAreaMultiplier;
+        coverMultiplier = m_coverAreaMultiplier;
+    }
+    void setKeepAndCoverAreaMultipliers(const WebCore::FloatSize& keepMultiplier, const WebCore::FloatSize& coverMultiplier);
+
+    void tileBufferUpdateComplete();
+
+    WebCore::IntRect mapToContents(const WebCore::IntRect&) const;
+    WebCore::IntRect mapFromContents(const WebCore::IntRect&) const;
+
+    bool hasPendingUpdates() const;
+
+private:
+    WebPageProxy* page();
+    WebCore::IntRect webViewVisibleRect();
+    void updateWebView(const Vector<WebCore::IntRect>& paintedArea);
+
+    void snapshotTaken(UpdateChunk&);
+
+    // DrawingAreaProxy
+    virtual void didReceiveMessage(CoreIPC::Connection*, CoreIPC::MessageID, CoreIPC::ArgumentDecoder*);
+    virtual void didReceiveSyncMessage(CoreIPC::Connection*, CoreIPC::MessageID, CoreIPC::ArgumentDecoder*, CoreIPC::ArgumentEncoder&);
+    virtual bool paint(const WebCore::IntRect&, PlatformDrawingContext);
+    virtual void sizeDidChange();
+    virtual void setPageIsVisible(bool isVisible);
+
+    void didSetSize(const WebCore::IntSize&);
+    void invalidate(const WebCore::IntRect& rect);
+    void adjustVisibleRect();
+
+    void requestTileUpdate(int tileID, const WebCore::IntRect& dirtyRect);
+
+    PassRefPtr<TiledDrawingAreaTile> createTile(const TiledDrawingAreaTile::Coordinate&);
+
+    void startTileBufferUpdateTimer();
+    void startTileCreationTimer();
+
+    void tileBufferUpdateTimerFired();
+    void tileCreationTimerFired();
+
+    void updateTileBuffers();
+    void createTiles();
+
+    bool resizeEdgeTiles();
+    void dropTilesOutsideRect(const WebCore::IntRect&);
+
+    PassRefPtr<TiledDrawingAreaTile> tileAt(const TiledDrawingAreaTile::Coordinate&) const;
+    void setTile(const TiledDrawingAreaTile::Coordinate& coordinate, RefPtr<TiledDrawingAreaTile> tile);
+    void removeTile(const TiledDrawingAreaTile::Coordinate& coordinate);
+    void removeAllTiles();
+
+    WebCore::IntRect contentsRect() const;
+
+    WebCore::IntRect calculateKeepRect(const WebCore::IntRect& visibleRect) const;
+    WebCore::IntRect calculateCoverRect(const WebCore::IntRect& visibleRect) const;
+
+    WebCore::IntRect tileRectForCoordinate(const TiledDrawingAreaTile::Coordinate&) const;
+    TiledDrawingAreaTile::Coordinate tileCoordinateForPoint(const WebCore::IntPoint&) const;
+    double tileDistance(const WebCore::IntRect& viewport, const TiledDrawingAreaTile::Coordinate&);
+
+private:
+    bool m_isWaitingForDidSetFrameNotification;
+    bool m_isVisible;
+
+    WebCore::IntSize m_viewSize; // Size of the BackingStore as well.
+    WebCore::IntSize m_lastSetViewSize;
+
+    PlatformWebView* m_webView;
+
+    typedef HashMap<TiledDrawingAreaTile::Coordinate, RefPtr<TiledDrawingAreaTile> > TileMap;
+    TileMap m_tiles;
+
+    WTF::HashMap<int, TiledDrawingAreaTile*> m_tilesByID;
+
+    typedef RunLoop::Timer<TiledDrawingAreaProxy> TileTimer;
+    TileTimer m_tileBufferUpdateTimer;
+    TileTimer m_tileCreationTimer;
+
+    WebCore::IntSize m_tileSize;
+    double m_tileCreationDelay;
+    WebCore::FloatSize m_keepAreaMultiplier;
+    WebCore::FloatSize m_coverAreaMultiplier;
+
+    WebCore::IntRect m_previousVisibleRect;
+    float m_contentsScale;
+
+    friend class TiledDrawingAreaTile;
+};
+
+} // namespace WebKit
+
+#endif // TILED_BACKING_STORE
+
+#endif // TiledDrawingAreaProxy_h