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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 USE(TILED_BACKING_STORE)
+
+#include "DrawingArea.h"
+#include "TiledBackingStoreClient.h"
+#include "TiledBackingStoreRemoteTile.h"
+#include <WebCore/IntRect.h>
+
+namespace WebKit {
+
+class TiledDrawingArea : public DrawingArea, public WebCore::TiledBackingStoreClient, public TiledBackingStoreRemoteTileClient {
+public:
+    explicit TiledDrawingArea(WebPage*);
+    virtual ~TiledDrawingArea();
+
+    virtual void setNeedsDisplay(const WebCore::IntRect&);
+    virtual void scroll(const WebCore::IntRect& scrollRect, const WebCore::IntSize& scrollDelta);
+
+#if USE(ACCELERATED_COMPOSITING)
+    virtual void attachCompositingContext() { }
+    virtual void detachCompositingContext() { }
+    virtual void setRootCompositingLayer(WebCore::GraphicsLayer*) { }
+    virtual void scheduleCompositingLayerSync() { }
+    virtual void didReceiveLayerTreeHostMessage(CoreIPC::Connection*, CoreIPC::MessageID, CoreIPC::ArgumentDecoder*);
+#endif
+
+private:
+    // CoreIPC message handlers.
+    virtual void setSize(const WebCore::IntSize& viewSize);
+    virtual void setVisibleContentRectAndScale(const WebCore::IntRect&, float);
+    virtual void setVisibleContentRectTrajectoryVector(const WebCore::FloatPoint&);
+    virtual void renderNextFrame();
+    virtual void suspendPainting();
+    virtual void resumePainting();
+
+    // TiledBackingStoreClient
+    virtual void tiledBackingStorePaintBegin();
+    virtual void tiledBackingStorePaint(WebCore::GraphicsContext*, const WebCore::IntRect& contentRect);
+    virtual void tiledBackingStorePaintEnd(const Vector<WebCore::IntRect>& paintedArea);
+    virtual bool tiledBackingStoreUpdatesAllowed() const;
+    virtual WebCore::IntRect tiledBackingStoreContentsRect();
+    virtual WebCore::IntRect tiledBackingStoreVisibleRect();
+    virtual WebCore::Color tiledBackingStoreBackgroundColor() const;
+
+    // TiledBackingStoreRemoteTileClient
+    virtual void createTile(int tileID, const UpdateInfo&);
+    virtual void updateTile(int tileID, const UpdateInfo&);
+    virtual void removeTile(int tileID);
+
+    bool m_suspended;
+    bool m_isWaitingForUIProcess;
+    bool m_didSendTileUpdate;
+    WebCore::IntRect m_visibleContentRect;
+
+    OwnPtr<WebCore::TiledBackingStore> m_mainBackingStore;
+    OwnPtr<WebCore::TiledBackingStore> m_previousBackingStore;
+};
+
+} // namespace WebKit
+
+#endif // USE(TILED_BACKING_STORE)
+
+#endif // TiledDrawingArea_h