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diff --git a/Source/WebKit2/WebProcess/WebPage/DrawingArea.h b/Source/WebKit2/WebProcess/WebPage/DrawingArea.h
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+++ b/Source/WebKit2/WebProcess/WebPage/DrawingArea.h
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+/*
+ * 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 DrawingArea_h
+#define DrawingArea_h
+
+#include "DrawingAreaInfo.h"
+#include <WebCore/FloatPoint.h>
+#include <WebCore/IntRect.h>
+#include <wtf/Noncopyable.h>
+#include <wtf/PassOwnPtr.h>
+
+namespace CoreIPC {
+    class ArgumentDecoder;
+    class Connection;
+    class MessageID;
+}
+
+namespace WebCore {
+    class GraphicsLayer;
+}
+
+namespace WebKit {
+
+class WebPage;
+struct WebPageCreationParameters;
+
+#if PLATFORM(WIN)
+struct WindowGeometry;
+#endif
+
+class DrawingArea {
+    WTF_MAKE_NONCOPYABLE(DrawingArea);
+
+public:
+    static PassOwnPtr<DrawingArea> create(WebPage*, const WebPageCreationParameters&);
+    virtual ~DrawingArea();
+    
+    void didReceiveDrawingAreaMessage(CoreIPC::Connection*, CoreIPC::MessageID, CoreIPC::ArgumentDecoder*);
+
+    virtual void setNeedsDisplay(const WebCore::IntRect&) = 0;
+    virtual void scroll(const WebCore::IntRect& scrollRect, const WebCore::IntSize& scrollOffset) = 0;
+
+    // FIXME: These should be pure virtual.
+    virtual void pageBackgroundTransparencyChanged() { }
+    virtual void forceRepaint() { }
+    virtual void setLayerTreeStateIsFrozen(bool) { }
+    virtual bool layerTreeStateIsFrozen() const { return false; }
+
+    virtual void didInstallPageOverlay() { }
+    virtual void didUninstallPageOverlay() { }
+    virtual void setPageOverlayNeedsDisplay(const WebCore::IntRect&) { }
+    virtual void pageCustomRepresentationChanged() { }
+
+    virtual void setPaintingEnabled(bool) { }
+
+#if USE(ACCELERATED_COMPOSITING)
+    virtual void setRootCompositingLayer(WebCore::GraphicsLayer*) = 0;
+    virtual void scheduleCompositingLayerSync() = 0;
+#if USE(TEXTURE_MAPPER)
+    virtual void didReceiveLayerTreeHostMessage(CoreIPC::Connection*, CoreIPC::MessageID, CoreIPC::ArgumentDecoder*) = 0;
+#endif
+#endif
+
+#if PLATFORM(WIN)
+    virtual void scheduleChildWindowGeometryUpdate(const WindowGeometry&) = 0;
+#endif
+
+protected:
+    DrawingArea(DrawingAreaType, WebPage*);
+
+    DrawingAreaType m_type;
+    WebPage* m_webPage;
+
+private:
+    // CoreIPC message handlers.
+    // FIXME: These should be pure virtual.
+    virtual void updateBackingStoreState(uint64_t backingStoreStateID, bool respondImmediately, float deviceScaleFactor, const WebCore::IntSize& size, const WebCore::IntSize& scrollOffset) { }
+    virtual void didUpdate() { }
+    virtual void suspendPainting() { }
+    virtual void resumePainting() { }
+
+#if PLATFORM(MAC)
+    // Used by TiledCoreAnimationDrawingArea.
+    virtual void updateGeometry(const WebCore::IntSize& viewSize) { }
+#endif
+
+#if USE(TILED_BACKING_STORE)
+    virtual void setSize(const WebCore::IntSize& viewSize) { }
+    virtual void setVisibleContentRectAndScale(const WebCore::IntRect&, float) { }
+    virtual void setVisibleContentRectTrajectoryVector(const WebCore::FloatPoint&) { }
+    virtual void setContentsScale(float scale) { }
+    virtual void renderNextFrame() { }
+    virtual void takeSnapshot(const WebCore::IntSize& targetSize, const WebCore::IntRect& contentsRect) { }
+#endif
+};
+
+} // namespace WebKit
+
+#endif // DrawingArea_h