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diff --git a/Source/WebKit2/WebProcess/WebPage/DrawingAreaImpl.h b/Source/WebKit2/WebProcess/WebPage/DrawingAreaImpl.h
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+++ b/Source/WebKit2/WebProcess/WebPage/DrawingAreaImpl.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 DrawingAreaImpl_h
+#define DrawingAreaImpl_h
+
+#include "DrawingArea.h"
+#include "LayerTreeHost.h"
+#include "RunLoop.h"
+#include <WebCore/Region.h>
+
+namespace WebCore {
+    class GraphicsContext;
+}
+
+namespace WebKit {
+
+class ShareableBitmap;
+class UpdateInfo;
+
+class DrawingAreaImpl : public DrawingArea {
+public:
+    static PassOwnPtr<DrawingAreaImpl> create(WebPage*, const WebPageCreationParameters&);
+    virtual ~DrawingAreaImpl();
+
+    void layerHostDidFlushLayers();
+
+private:
+    DrawingAreaImpl(WebPage*, const WebPageCreationParameters&);
+
+    // DrawingArea
+    virtual void setNeedsDisplay(const WebCore::IntRect&);
+    virtual void scroll(const WebCore::IntRect& scrollRect, const WebCore::IntSize& scrollOffset);
+    virtual void setLayerTreeStateIsFrozen(bool);
+    virtual bool layerTreeStateIsFrozen() const { return m_layerTreeStateIsFrozen; }
+    virtual void forceRepaint();
+
+    virtual void didInstallPageOverlay();
+    virtual void didUninstallPageOverlay();
+    virtual void setPageOverlayNeedsDisplay(const WebCore::IntRect&);
+
+    virtual void setPaintingEnabled(bool);
+
+    virtual void setRootCompositingLayer(WebCore::GraphicsLayer*);
+    virtual void scheduleCompositingLayerSync();
+
+#if PLATFORM(WIN)
+    virtual void scheduleChildWindowGeometryUpdate(const WindowGeometry&);
+#endif
+
+#if USE(ACCELERATED_COMPOSITING) && USE(TEXTURE_MAPPER)
+    virtual void didReceiveLayerTreeHostMessage(CoreIPC::Connection*, CoreIPC::MessageID, CoreIPC::ArgumentDecoder*);
+#endif
+
+    // CoreIPC message handlers.
+    virtual void updateBackingStoreState(uint64_t backingStoreStateID, bool respondImmediately, float deviceScaleFactor, const WebCore::IntSize&, const WebCore::IntSize& scrollOffset);
+    virtual void didUpdate();
+    virtual void suspendPainting();
+    virtual void resumePainting();
+    
+    virtual void pageCustomRepresentationChanged();
+
+    void sendDidUpdateBackingStoreState();
+
+    void enterAcceleratedCompositingMode(WebCore::GraphicsLayer*);
+    void exitAcceleratedCompositingModeSoon();
+    bool exitAcceleratedCompositingModePending() const { return m_exitCompositingTimer.isActive(); }
+    void exitAcceleratedCompositingMode();
+
+    void scheduleDisplay();
+    void displayTimerFired();
+    void display();
+    void display(UpdateInfo&);
+    PassOwnPtr<WebCore::GraphicsContext> createGraphicsContext(ShareableBitmap*);
+
+    uint64_t m_backingStoreStateID;
+
+    WebCore::Region m_dirtyRegion;
+    WebCore::IntRect m_scrollRect;
+    WebCore::IntSize m_scrollOffset;
+
+    // Whether painting is enabled. If painting is disabled, any calls to setNeedsDisplay and scroll are ignored.
+    bool m_isPaintingEnabled;
+
+    // Whether we're currently processing an UpdateBackingStoreState message.
+    bool m_inUpdateBackingStoreState;
+
+    // When true, we should send an UpdateBackingStoreState message instead of any other messages
+    // we normally send to the UI process.
+    bool m_shouldSendDidUpdateBackingStoreState;
+
+    // Whether we're waiting for a DidUpdate message. Used for throttling paints so that the 
+    // web process won't paint more frequent than the UI process can handle.
+    bool m_isWaitingForDidUpdate;
+    
+    // True between sending the 'enter compositing' messages, and the 'exit compositing' message.
+    bool m_compositingAccordingToProxyMessages;
+
+    // When true, we maintain the layer tree in its current state by not leaving accelerated compositing mode
+    // and not scheduling layer flushes.
+    bool m_layerTreeStateIsFrozen;
+
+    // True when we were asked to exit accelerated compositing mode but couldn't because layer tree
+    // state was frozen.
+    bool m_wantsToExitAcceleratedCompositingMode;
+
+    // Whether painting is suspended. We'll still keep track of the dirty region but we 
+    // won't paint until painting has resumed again.
+    bool m_isPaintingSuspended;
+    bool m_alwaysUseCompositing;
+
+    RunLoop::Timer<DrawingAreaImpl> m_displayTimer;
+    RunLoop::Timer<DrawingAreaImpl> m_exitCompositingTimer;
+
+    // The layer tree host that handles accelerated compositing.
+    RefPtr<LayerTreeHost> m_layerTreeHost;
+};
+
+} // namespace WebKit
+
+#endif // DrawingAreaImpl_h