diff -r 000000000000 -r 4f2f89ce4247 WebKit2/WebProcess/WebPage/DrawingArea.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WebKit2/WebProcess/WebPage/DrawingArea.h	Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,96 @@
+/*
+ * 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 <WebCore/IntRect.h>
+
+namespace WebCore {
+    class IntRect;
+    class IntSize;
+#if USE(ACCELERATED_COMPOSITING)
+    class GraphicsLayer;
+#endif
+}
+
+namespace CoreIPC {
+    class ArgumentDecoder;
+    class Connection;
+    class MessageID;
+}
+
+namespace WebKit {
+
+class WebPage;
+
+class DrawingArea {
+public:
+    // This has to match DrawingAreaProxy::Type.
+    enum Type {
+        None,
+        ChunkedUpdateDrawingAreaType,
+#if USE(ACCELERATED_COMPOSITING)
+        LayerBackedDrawingAreaType,
+#endif
+    };
+
+    // FIXME: It might make sense to move this create function into a factory style class. 
+    static DrawingArea* create(Type, WebPage*);
+    virtual ~DrawingArea();
+    
+    Type type() const { return m_type; }
+    
+    virtual void invalidateWindow(const WebCore::IntRect& rect, bool immediate) = 0;
+    virtual void invalidateContentsAndWindow(const WebCore::IntRect& rect, bool immediate) = 0;
+    virtual void invalidateContentsForSlowScroll(const WebCore::IntRect& rect, bool immediate) = 0;
+    virtual void scroll(const WebCore::IntSize& scrollDelta, const WebCore::IntRect& rectToScroll, const WebCore::IntRect& clipRect) = 0;
+
+    virtual void setNeedsDisplay(const WebCore::IntRect&) = 0;
+    virtual void display() = 0;
+
+#if USE(ACCELERATED_COMPOSITING)
+    virtual void attachCompositingContext() = 0;
+    virtual void detachCompositingContext() = 0;
+    virtual void setRootCompositingLayer(WebCore::GraphicsLayer*) = 0;
+    virtual void scheduleCompositingLayerSync() = 0;
+    virtual void syncCompositingLayers() = 0;
+#endif
+
+    virtual void didReceiveMessage(CoreIPC::Connection*, CoreIPC::MessageID, CoreIPC::ArgumentDecoder&) = 0;
+
+    // The DrawingArea should never be encoded itself. Instead, the DrawingAreaProxy should be encoded.
+    // The DrawingArea should also never be decoded itself. Instead, the DrawingArea::Type should be decoded.
+
+protected:
+    DrawingArea(Type, WebPage*);
+
+    Type m_type;
+    WebPage* m_webPage;
+};
+
+} // namespace WebKit
+
+#endif // DrawingArea_h