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diff --git a/Source/WebCore/html/canvas/WebGLObject.h b/Source/WebCore/html/canvas/WebGLObject.h
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+++ b/Source/WebCore/html/canvas/WebGLObject.h
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+/*
+ * Copyright (C) 2009 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 COMPUTER, INC. ``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 COMPUTER, INC. OR
+ * 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 WebGLObject_h
+#define WebGLObject_h
+
+#include "GraphicsContext3D.h"
+
+#include <wtf/PassRefPtr.h>
+#include <wtf/RefCounted.h>
+
+namespace WebCore {
+
+class WebGLRenderingContext;
+
+class WebGLObject : public RefCounted<WebGLObject> {
+public:
+    virtual ~WebGLObject();
+
+    Platform3DObject object() const { return m_object; }
+
+    // deleteObject may not always delete the OpenGL resource.  For programs and
+    // shaders, deletion is delayed until they are no longer attached.
+    // FIXME: revisit this when resource sharing between contexts are implemented.
+    void deleteObject();
+
+    void detachContext()
+    {
+        m_attachmentCount = 0; // Make sure OpenGL resource is deleted.
+        deleteObject();
+        m_context = 0;
+    }
+
+    WebGLRenderingContext* context() const { return m_context; }
+
+    virtual bool isBuffer() const { return false; }
+    virtual bool isFramebuffer() const { return false; }
+    virtual bool isProgram() const { return false; }
+    virtual bool isRenderbuffer() const { return false; }
+    virtual bool isShader() const { return false; }
+    virtual bool isTexture() const { return false; }
+
+    void onAttached() { ++m_attachmentCount; }
+    void onDetached()
+    {
+        if (m_attachmentCount)
+            --m_attachmentCount;
+        if (m_deleted)
+            deleteObject();
+    }
+
+    // This indicates whether the client side issue a delete call already, not
+    // whether the OpenGL resource is deleted.
+    // object()==0 indicates the OpenGL resource is deleted.
+    bool isDeleted() { return m_deleted; }
+
+protected:
+    WebGLObject(WebGLRenderingContext*);
+
+    // setObject should be only called once right after creating a WebGLObject.
+    void setObject(Platform3DObject);
+
+    // deleteObjectImpl should be only called once to delete the OpenGL resource.
+    virtual void deleteObjectImpl(Platform3DObject) = 0;
+
+private:
+    Platform3DObject m_object;
+    WebGLRenderingContext* m_context;
+    unsigned m_attachmentCount;
+    bool m_deleted;
+};
+
+} // namespace WebCore
+
+#endif // WebGLObject_h