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diff --git a/Source/WebKit2/WebProcess/WebPage/LayerBackedDrawingArea.h b/Source/WebKit2/WebProcess/WebPage/LayerBackedDrawingArea.h
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+++ b/Source/WebKit2/WebProcess/WebPage/LayerBackedDrawingArea.h
@@ -0,0 +1,125 @@
+/*
+ * 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 LayerBackedDrawingArea_h
+#define LayerBackedDrawingArea_h
+
+#if USE(ACCELERATED_COMPOSITING)
+
+#include "DrawingArea.h"
+#include "RunLoop.h"
+#include <WebCore/IntPoint.h>
+#include <WebCore/GraphicsLayerClient.h>
+
+#if PLATFORM(MAC)
+#include <wtf/RetainPtr.h>
+#ifdef __OBJC__
+@class CALayer;
+#else
+class CALayer;
+#endif
+typedef struct __WKCARemoteLayerClientRef *WKCARemoteLayerClientRef;
+#endif
+
+namespace WebCore {
+    class GraphicsContext;
+    class GraphicsLayer;
+}
+
+namespace WebKit {
+
+class LayerBackedDrawingArea : public DrawingArea, private WebCore::GraphicsLayerClient {
+public:
+    LayerBackedDrawingArea(DrawingAreaInfo::Identifier identifier, WebPage*);
+    virtual ~LayerBackedDrawingArea();
+
+    virtual void setNeedsDisplay(const WebCore::IntRect&);
+    virtual void scroll(const WebCore::IntRect& scrollRect, const WebCore::IntSize& scrollDelta);
+    virtual void display();
+
+    virtual void pageBackgroundTransparencyChanged();
+
+    virtual void attachCompositingContext();
+    virtual void detachCompositingContext();
+    virtual void setRootCompositingLayer(WebCore::GraphicsLayer*);
+    virtual void scheduleCompositingLayerSync();
+    virtual void syncCompositingLayers();
+
+    virtual void didReceiveMessage(CoreIPC::Connection*, CoreIPC::MessageID, CoreIPC::ArgumentDecoder*);
+
+private:
+
+    // GraphicsLayerClient
+    virtual void notifyAnimationStarted(const WebCore::GraphicsLayer*, double /*time*/) { }
+    virtual void notifySyncRequired(const WebCore::GraphicsLayer*) { }
+public:
+    virtual void paintContents(const WebCore::GraphicsLayer*, WebCore::GraphicsContext&, WebCore::GraphicsLayerPaintingPhase, const WebCore::IntRect& inClip);
+private:
+    virtual bool showDebugBorders() const;
+    virtual bool showRepaintCounter() const;
+
+#if PLATFORM(MAC)
+    virtual void onPageClose();
+#endif
+
+    void scheduleDisplay();
+    
+    // CoreIPC message handlers.
+    void setSize(const WebCore::IntSize& viewSize);
+    void suspendPainting();
+    void resumePainting();
+    void didUpdate();
+    
+    void platformInit();
+    void platformClear();
+
+#if PLATFORM(MAC)
+    void setUpUpdateLayoutRunLoopObserver();
+    void scheduleUpdateLayoutRunLoopObserver();
+    void removeUpdateLayoutRunLoopObserver();
+
+    static void updateLayoutRunLoopObserverCallback(CFRunLoopObserverRef, CFRunLoopActivity, void*);
+    void updateLayoutRunLoopObserverFired();
+#endif
+
+    RunLoop::Timer<LayerBackedDrawingArea> m_syncTimer;
+
+    OwnPtr<WebCore::GraphicsLayer> m_backingLayer;
+#if PLATFORM(MAC)
+#if HAVE(HOSTED_CORE_ANIMATION)
+    RetainPtr<WKCARemoteLayerClientRef> m_remoteLayerRef;
+#endif
+    RetainPtr<CFRunLoopObserverRef> m_updateLayoutRunLoopObserver;
+#endif
+
+    bool m_attached;
+    bool m_shouldPaint;
+};
+
+} // namespace WebKit
+
+#endif // USE(ACCELERATED_COMPOSITING)
+
+#endif // LayerBackedDrawingArea_h