Moved GL enums from GraphicsContext3D to a more generic location.

Source/core/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
@@ skipping 194 matching lines @@
         COLOR_ATTACHMENT7_EXT = 0x8CE7,
         COLOR_ATTACHMENT8_EXT = 0x8CE8,
         COLOR_ATTACHMENT9_EXT = 0x8CE9,
         COLOR_ATTACHMENT10_EXT = 0x8CEA,
         COLOR_ATTACHMENT11_EXT = 0x8CEB,
         COLOR_ATTACHMENT12_EXT = 0x8CEC,
         COLOR_ATTACHMENT13_EXT = 0x8CED,
         COLOR_ATTACHMENT14_EXT = 0x8CEE,
         COLOR_ATTACHMENT15_EXT = 0x8CEF,
 
-        // GL_OES_EGL_image_external
-        GL_TEXTURE_EXTERNAL_OES = 0x8D65,
-
         // GL_CHROMIUM_map_sub (enums inherited from GL_ARB_vertex_buffer_object)
         READ_ONLY = 0x88B8,
         WRITE_ONLY = 0x88B9,
 
-        // GL_ANGLE_texture_usage
-        GL_TEXTURE_USAGE_ANGLE = 0x93A2,
-        GL_FRAMEBUFFER_ATTACHMENT_ANGLE = 0x93A3,
-
         // GL_EXT_texture_storage
         BGRA8_EXT = 0x93A1,
 
         // GL_EXT_occlusion_query_boolean
         ANY_SAMPLES_PASSED_EXT = 0x8C2F,
         ANY_SAMPLES_PASSED_CONSERVATIVE_EXT = 0x8D6A,
         CURRENT_QUERY_EXT = 0x8865,
         QUERY_RESULT_EXT = 0x8866,
         QUERY_RESULT_AVAILABLE_EXT = 0x8867,
 
@@ skipping 88 matching lines @@
     friend class GraphicsContext3D;
     explicit Extensions3D(GraphicsContext3D*);
 
     // Weak pointer back to GraphicsContext3D.
     GraphicsContext3D* m_context;
 };
 
 } // namespace WebCore
 
 #endif // Extensions3D_h