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diff --git a/Source/WebKit2/UIProcess/DrawingAreaProxyImpl.h b/Source/WebKit2/UIProcess/DrawingAreaProxyImpl.h
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+++ b/Source/WebKit2/UIProcess/DrawingAreaProxyImpl.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 DrawingAreaProxyImpl_h
+#define DrawingAreaProxyImpl_h
+
+#include "BackingStore.h"
+#include "DrawingAreaProxy.h"
+#include "LayerTreeContext.h"
+#include "RunLoop.h"
+#include <wtf/OwnPtr.h>
+#include <wtf/PassOwnPtr.h>
+
+namespace WebCore {
+class Region;
+}
+
+namespace WebKit {
+
+class LayerTreeHostProxy;
+
+class DrawingAreaProxyImpl : public DrawingAreaProxy {
+public:
+    static PassOwnPtr<DrawingAreaProxyImpl> create(WebPageProxy*);
+    virtual ~DrawingAreaProxyImpl();
+
+    void paint(BackingStore::PlatformGraphicsContext, const WebCore::IntRect&, WebCore::Region& unpaintedRegion);
+
+private:
+    explicit DrawingAreaProxyImpl(WebPageProxy*);
+
+    // DrawingAreaProxy
+    virtual void sizeDidChange();
+    virtual void deviceScaleFactorDidChange();
+    virtual void visibilityDidChange();
+    virtual void setBackingStoreIsDiscardable(bool);
+    virtual void waitForBackingStoreUpdateOnNextPaint();
+
+    // CoreIPC message handlers
+    virtual void update(uint64_t backingStoreStateID, const UpdateInfo&);
+    virtual void didUpdateBackingStoreState(uint64_t backingStoreStateID, const UpdateInfo&, const LayerTreeContext&);
+    virtual void enterAcceleratedCompositingMode(uint64_t backingStoreStateID, const LayerTreeContext&);
+    virtual void exitAcceleratedCompositingMode(uint64_t backingStoreStateID, const UpdateInfo&);
+
+    void incorporateUpdate(const UpdateInfo&);
+
+    enum RespondImmediatelyOrNot { DoNotRespondImmediately, RespondImmediately };
+    void backingStoreStateDidChange(RespondImmediatelyOrNot);
+    void sendUpdateBackingStoreState(RespondImmediatelyOrNot);
+    void waitForAndDispatchDidUpdateBackingStoreState();
+
+#if USE(ACCELERATED_COMPOSITING)
+    void enterAcceleratedCompositingMode(const LayerTreeContext&);
+    void exitAcceleratedCompositingMode();
+
+    bool isInAcceleratedCompositingMode() const { return !m_layerTreeContext.isEmpty(); }
+
+#if USE(TILED_BACKING_STORE)
+    virtual void setVisibleContentsRectAndScale(const WebCore::IntRect& visibleContentsRect, float scale);
+    virtual void setVisibleContentRectTrajectoryVector(const WebCore::FloatPoint&);
+    virtual void paintToCurrentGLContext(const WebCore::TransformationMatrix&, float opacity);
+    void didReceiveLayerTreeHostProxyMessage(CoreIPC::Connection*, CoreIPC::MessageID, CoreIPC::ArgumentDecoder*);
+#endif
+#else
+    bool isInAcceleratedCompositingMode() const { return false; }
+#endif
+
+    virtual void pageCustomRepresentationChanged();
+
+    void discardBackingStoreSoon();
+    void discardBackingStore();
+
+    // The state ID corresponding to our current backing store. Updated whenever we allocate
+    // a new backing store. Any messages received that correspond to an earlier state are ignored,
+    // as they don't apply to our current backing store.
+    uint64_t m_currentBackingStoreStateID;
+
+    // The next backing store state ID we will request the web process update to. Incremented
+    // whenever our state changes in a way that will require a new backing store to be allocated.
+    uint64_t m_nextBackingStoreStateID;
+
+#if USE(ACCELERATED_COMPOSITING)
+    // The current layer tree context.
+    LayerTreeContext m_layerTreeContext;
+#endif
+
+    // Whether we've sent a UpdateBackingStoreState message and are now waiting for a DidUpdateBackingStoreState message.
+    // Used to throttle UpdateBackingStoreState messages so we don't send them faster than the Web process can handle.
+    bool m_isWaitingForDidUpdateBackingStoreState;
+    
+    // For a new Drawing Area don't draw anything until the WebProcess has sent over the first content.
+    bool m_hasReceivedFirstUpdate;
+
+    bool m_isBackingStoreDiscardable;
+    OwnPtr<BackingStore> m_backingStore;
+
+    RunLoop::Timer<DrawingAreaProxyImpl> m_discardBackingStoreTimer;
+};
+
+} // namespace WebKit
+
+#endif // DrawingAreaProxyImpl_h