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diff --git a/Source/WebKit2/UIProcess/DrawingAreaProxy.h b/Source/WebKit2/UIProcess/DrawingAreaProxy.h
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+++ b/Source/WebKit2/UIProcess/DrawingAreaProxy.h
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+/*
+ * Copyright (C) 2010 Apple Inc. All rights reserved.
+ * Portions Copyright (c) 2010 Motorola Mobility, 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 DrawingAreaProxy_h
+#define DrawingAreaProxy_h
+
+#include "DrawingAreaInfo.h"
+#include <WebCore/IntRect.h>
+#include <WebCore/IntSize.h>
+#include <stdint.h>
+#include <wtf/Noncopyable.h>
+
+#if PLATFORM(QT)
+class QPainter;
+#elif PLATFORM(GTK)
+typedef struct _cairo cairo_t;
+#endif
+
+namespace CoreIPC {
+    class ArgumentDecoder;
+    class Connection;
+    class MessageID;
+}
+
+namespace WebCore {
+    class FloatPoint;
+    class TransformationMatrix;
+}
+
+namespace WebKit {
+
+class LayerTreeContext;
+class LayerTreeHostProxy;
+class UpdateInfo;
+class WebLayerTreeInfo;
+class WebLayerUpdateInfo;
+class WebPageProxy;
+
+class DrawingAreaProxy {
+    WTF_MAKE_NONCOPYABLE(DrawingAreaProxy);
+
+public:
+    virtual ~DrawingAreaProxy();
+
+    DrawingAreaType type() const { return m_type; }
+
+    void didReceiveDrawingAreaProxyMessage(CoreIPC::Connection*, CoreIPC::MessageID, CoreIPC::ArgumentDecoder*);
+
+    virtual void deviceScaleFactorDidChange() = 0;
+
+    // FIXME: These should be pure virtual.
+    virtual void visibilityDidChange() { }
+    virtual void setBackingStoreIsDiscardable(bool) { }
+
+    virtual void waitForBackingStoreUpdateOnNextPaint() { }
+
+    const WebCore::IntSize& size() const { return m_size; }
+    void setSize(const WebCore::IntSize&, const WebCore::IntSize& scrollOffset);
+
+    virtual void pageCustomRepresentationChanged() { }
+
+#if USE(ACCELERATED_COMPOSITING) && USE(TEXTURE_MAPPER)
+    virtual void updateViewport();
+    virtual WebCore::IntRect viewportVisibleRect() const { return contentsRect(); }
+    virtual WebCore::IntRect contentsRect() const;
+    virtual bool isBackingStoreReady() const { return true; }
+    virtual void paintToCurrentGLContext(const WebCore::TransformationMatrix&, float opacity) { }
+    LayerTreeHostProxy* layerTreeHostProxy() const { return m_layerTreeHostProxy.get(); }
+
+#if USE(TILED_BACKING_STORE)
+    virtual void setVisibleContentsRectAndScale(const WebCore::IntRect& visibleContentsRect, float scale) { }
+    virtual void setVisibleContentRectTrajectoryVector(const WebCore::FloatPoint&) { }
+    virtual void createTileForLayer(int layerID, int tileID, const WebKit::UpdateInfo&) { }
+    virtual void updateTileForLayer(int layerID, int tileID, const WebKit::UpdateInfo&) { }
+    virtual void removeTileForLayer(int layerID, int tileID) { }
+    virtual void didReceiveLayerTreeHostProxyMessage(CoreIPC::Connection*, CoreIPC::MessageID, CoreIPC::ArgumentDecoder*);
+
+    WebPageProxy* page() { return m_webPageProxy; }
+#endif
+#endif
+protected:
+    explicit DrawingAreaProxy(DrawingAreaType, WebPageProxy*);
+
+    DrawingAreaType m_type;
+    WebPageProxy* m_webPageProxy;
+
+    WebCore::IntSize m_size;
+    WebCore::IntSize m_scrollOffset;
+
+#if USE(ACCELERATED_COMPOSITING) && USE(TEXTURE_MAPPER)
+    OwnPtr<LayerTreeHostProxy> m_layerTreeHostProxy;
+#endif
+
+private:
+    virtual void sizeDidChange() = 0;
+
+    // CoreIPC message handlers.
+    // FIXME: These should be pure virtual.
+    virtual void update(uint64_t backingStoreStateID, const UpdateInfo&) { }
+    virtual void didUpdateBackingStoreState(uint64_t backingStoreStateID, const UpdateInfo&, const LayerTreeContext&) { }
+#if USE(ACCELERATED_COMPOSITING)
+    virtual void enterAcceleratedCompositingMode(uint64_t backingStoreStateID, const LayerTreeContext&) { }
+    virtual void exitAcceleratedCompositingMode(uint64_t backingStoreStateID, const UpdateInfo&) { }
+#endif
+#if PLATFORM(MAC)
+    virtual void didUpdateGeometry() { }
+#endif
+#if USE(TILED_BACKING_STORE)
+    virtual void snapshotTaken(const UpdateInfo&) { }
+    virtual void createTile(int tileID, const UpdateInfo& updateInfo) { }
+    virtual void updateTile(int tileID, const UpdateInfo& updateInfo) { }
+    virtual void didRenderFrame() { }
+    virtual void removeTile(int tileID) { }
+    virtual void allTileUpdatesProcessed() { }
+#endif
+};
+
+} // namespace WebKit
+
+#endif // DrawingAreaProxy_h