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diff --git a/Source/WebKit2/Shared/mac/ShareableSurface.h b/Source/WebKit2/Shared/mac/ShareableSurface.h
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+++ b/Source/WebKit2/Shared/mac/ShareableSurface.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 ShareableSurface_h
+#define ShareableSurface_h
+
+#include <WebCore/IntSize.h>
+#include <wtf/Noncopyable.h>
+#include <wtf/PassRefPtr.h>
+#include <wtf/RefCounted.h>
+#include <wtf/RetainPtr.h>
+
+typedef struct _CGLContextObject* CGLContextObj;
+typedef struct __IOSurface* IOSurfaceRef;
+
+namespace CoreIPC {
+    class ArgumentDecoder;
+    class ArgumentEncoder;
+}
+
+namespace WebKit {
+
+class ShareableSurface : public RefCounted<ShareableSurface> {
+public:
+    class Handle {
+        WTF_MAKE_NONCOPYABLE(Handle);
+    
+    public:
+        Handle();
+        ~Handle();
+
+        void encode(CoreIPC::ArgumentEncoder*) const;
+        static bool decode(CoreIPC::ArgumentDecoder*, Handle&);
+
+    private:
+        friend class ShareableSurface;
+
+        mutable mach_port_t m_port;
+    };
+
+    // Create a shareable surface with the given size. Returns 0 on failure.
+    static PassRefPtr<ShareableSurface> create(CGLContextObj, const WebCore::IntSize&);
+
+    // Create a shareable surface from a handle. Returns 0 on failure.
+    static PassRefPtr<ShareableSurface> create(CGLContextObj, const Handle&);
+
+    ~ShareableSurface();
+
+    bool createHandle(Handle&);
+    
+    unsigned textureID();
+
+    void attach();
+    void detach();
+
+private:
+    ShareableSurface(CGLContextObj, const WebCore::IntSize&, IOSurfaceRef);
+
+    // The OpenGL context.
+    CGLContextObj m_cglContextObj;
+
+    // The size of the surface.
+    WebCore::IntSize m_size;
+    
+    // The ID of the texture.
+    unsigned m_textureID;
+
+    // The frame buffer object ID of the texture; used when the surface is used as a render destination.
+    unsigned m_frameBufferObjectID;
+
+    RetainPtr<IOSurfaceRef> m_ioSurface;
+};
+
+} // namespace WebKit
+
+#endif // ShareableSurface_h