Moving GraphicsContext and dependencies from core to platform.

Source/platform/graphics/Extensions3D.h

 /*
  * Copyright (C) 2011 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
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 #ifndef Extensions3D_h
 #define Extensions3D_h
 
+#include "platform/PlatformExport.h"
 #include "platform/graphics/GraphicsTypes3D.h"
 
 #include "wtf/text/WTFString.h"
 
 namespace WebCore {
 
 class GraphicsContext3D;
 class ImageBuffer;
 
 // The supported extensions are defined below.
 //
 // 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 {
+class PLATFORM_EXPORT Extensions3D {
 public:
     ~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
@@ skipping 270 matching lines @@
     friend class GraphicsContext3D;
     explicit Extensions3D(GraphicsContext3D*);
 
     // Weak pointer back to GraphicsContext3D.
     GraphicsContext3D* m_context;
 };
 
 } // namespace WebCore
 
 #endif // Extensions3D_h