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diff --git a/Source/WebKit2/WebProcess/WebPage/mac/LayerTreeHostMac.h b/Source/WebKit2/WebProcess/WebPage/mac/LayerTreeHostMac.h
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+++ b/Source/WebKit2/WebProcess/WebPage/mac/LayerTreeHostMac.h
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+/*
+ * Copyright (C) 2011 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 LayerTreeHostMac_h
+#define LayerTreeHostMac_h
+
+#include "LayerTreeContext.h"
+#include "LayerTreeHost.h"
+#include <WebCore/GraphicsLayerClient.h>
+#include <wtf/OwnPtr.h>
+#include <wtf/RetainPtr.h>
+
+typedef struct __WKCARemoteLayerClientRef* WKCARemoteLayerClientRef;
+
+namespace WebKit {
+
+class LayerTreeHostMac : public LayerTreeHost, WebCore::GraphicsLayerClient {
+public:
+    static PassRefPtr<LayerTreeHostMac> create(WebPage*);
+    ~LayerTreeHostMac();
+    
+private:
+    explicit LayerTreeHostMac(WebPage*);
+
+    // LayerTreeHost.
+    virtual const LayerTreeContext& layerTreeContext();
+    virtual void scheduleLayerFlush();
+    virtual void setRootCompositingLayer(WebCore::GraphicsLayer*);
+    virtual void invalidate();
+
+    virtual void setNonCompositedContentsNeedDisplay(const WebCore::IntRect&);
+    virtual void scrollNonCompositedContents(const WebCore::IntRect& scrollRect, const WebCore::IntSize& scrollOffset);
+    virtual void sizeDidChange(const WebCore::IntSize& newSize);
+
+    virtual void didInstallPageOverlay();
+    virtual void didUninstallPageOverlay();
+    virtual void setPageOverlayNeedsDisplay(const WebCore::IntRect&);
+
+    // GraphicsLayerClient
+    virtual void notifyAnimationStarted(const WebCore::GraphicsLayer*, double time);
+    virtual void notifySyncRequired(const WebCore::GraphicsLayer*);
+    virtual void paintContents(const WebCore::GraphicsLayer*, WebCore::GraphicsContext&, WebCore::GraphicsLayerPaintingPhase, const WebCore::IntRect& clipRect);
+    virtual bool showDebugBorders() const;
+    virtual bool showRepaintCounter() const;
+
+    static void flushPendingLayerChangesRunLoopObserverCallback(CFRunLoopObserverRef, CFRunLoopActivity, void*);
+    void flushPendingLayerChangesRunLoopObserverCallback();
+    bool flushPendingLayerChanges();
+
+    void createPageOverlayLayer();
+    void destroyPageOverlayLayer();
+
+    // The context for this layer tree.
+    LayerTreeContext m_layerTreeContext;
+
+    // Whether the layer tree host is valid or not.
+    bool m_isValid;    
+
+    // The root layer.
+    OwnPtr<WebCore::GraphicsLayer> m_rootLayer;
+
+    // The layer which contains all non-composited content.
+    OwnPtr<WebCore::GraphicsLayer> m_nonCompositedContentLayer;
+
+    // The page overlay layer. Will be null if there's no page overlay.
+    OwnPtr<WebCore::GraphicsLayer> m_pageOverlayLayer;
+
+    RetainPtr<WKCARemoteLayerClientRef> m_remoteLayerClient;
+    RetainPtr<CFRunLoopObserverRef> m_flushPendingLayerChangesRunLoopObserver;
+};
+
+} // namespace WebKit
+
+#endif // LayerTreeHostMac_h