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diff --git a/Source/WebCore/platform/graphics/Extensions3D.h b/Source/WebCore/platform/graphics/Extensions3D.h
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+/*
+ * Copyright (C) 2010 Google 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 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 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 Extensions3D_h
+#define Extensions3D_h
+
+#include <wtf/text/WTFString.h>
+
+namespace WebCore {
+
+// This is a base class containing only pure virtual functions.
+// Implementations must provide a subclass.
+//
+// The supported extensions are defined below and in subclasses,
+// possibly platform-specific ones.
+//
+// Calling any extension function not supported by the current context
+// must be a no-op; in particular, it may not have side effects. In
+// this situation, if the function has a return value, 0 is returned.
+class Extensions3D {
+public:
+    virtual ~Extensions3D() {}
+
+    // Supported extensions:
+    //   GL_EXT_texture_format_BGRA8888
+    //   GL_EXT_read_format_bgra
+    //   GL_ARB_robustness
+    //   GL_ARB_texture_non_power_of_two / GL_OES_texture_npot
+    //   GL_EXT_packed_depth_stencil / GL_OES_packed_depth_stencil
+    //   GL_ANGLE_framebuffer_blit / GL_ANGLE_framebuffer_multisample
+    //   GL_OES_texture_float
+
+    // Takes full name of extension; for example,
+    // "GL_EXT_texture_format_BGRA8888".
+    virtual bool supports(const String&) = 0;
+
+    // Certain OpenGL and WebGL implementations may support enabling
+    // extensions lazily. This method may only be called with
+    // extension names for which supports returns true.
+    virtual void ensureEnabled(const String&) = 0;
+
+    enum ExtensionsEnumType {
+        // GL_EXT_texture_format_BGRA8888 enums
+        BGRA_EXT = 0x80E1,
+
+        // GL_ARB_robustness enums
+        GUILTY_CONTEXT_RESET_ARB = 0x8253,
+        INNOCENT_CONTEXT_RESET_ARB = 0x8254,
+        UNKNOWN_CONTEXT_RESET_ARB = 0x8255,
+
+        // GL_EXT/OES_packed_depth_stencil enums
+        DEPTH24_STENCIL8 = 0x88F0,
+        
+        // GL_ANGLE_framebuffer_blit names
+        READ_FRAMEBUFFER = 0x8CA8,
+        DRAW_FRAMEBUFFER = 0x8CA9,
+        DRAW_FRAMEBUFFER_BINDING = 0x8CA6, 
+        READ_FRAMEBUFFER_BINDING = 0x8CAA,
+        
+        // GL_ANGLE_framebuffer_multisample names
+        RENDERBUFFER_SAMPLES = 0x8CAB,
+        FRAMEBUFFER_INCOMPLETE_MULTISAMPLE = 0x8D56,
+        MAX_SAMPLES = 0x8D57
+    };
+
+    // GL_ARB_robustness
+    virtual int getGraphicsResetStatusARB() = 0;
+    
+    // GL_ANGLE_framebuffer_blit
+    virtual void blitFramebuffer(long srcX0, long srcY0, long srcX1, long srcY1, long dstX0, long dstY0, long dstX1, long dstY1, unsigned long mask, unsigned long filter) = 0;
+    
+    // GL_ANGLE_framebuffer_multisample
+    virtual void renderbufferStorageMultisample(unsigned long target, unsigned long samples, unsigned long internalformat, unsigned long width, unsigned long height) = 0;    
+};
+
+} // namespace WebCore
+
+#endif // Extensions3D_h