Completely removed the Extensions3D class (Take 2)

Source/platform/graphics/GraphicsTypes3D.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
@@ skipping 21 matching lines @@
 typedef unsigned Platform3DObject;
 
 // WebGL-specific enums
 const unsigned GC3D_DEPTH_STENCIL_ATTACHMENT_WEBGL = 0x821A;
 const unsigned GC3D_UNPACK_FLIP_Y_WEBGL = 0x9240;
 const unsigned GC3D_UNPACK_PREMULTIPLY_ALPHA_WEBGL = 0x9241;
 const unsigned GC3D_CONTEXT_LOST_WEBGL = 0x9242;
 const unsigned GC3D_UNPACK_COLORSPACE_CONVERSION_WEBGL = 0x9243;
 const unsigned GC3D_BROWSER_DEFAULT_WEBGL = 0x9244;
 
+// GL_CHROMIUM_flipy
+const unsigned GC3D_UNPACK_FLIP_Y_CHROMIUM = 0x9240;
+
+// GL_CHROMIUM_copy_texture
+const unsigned GC3D_UNPACK_PREMULTIPLY_ALPHA_CHROMIUM = 0x9241;
+const unsigned GC3D_UNPACK_UNPREMULTIPLY_ALPHA_CHROMIUM = 0x9242;
+
+// GL_AMD_compressed_ATC_texture
+const unsigned GC3D_COMPRESSED_ATC_RGB_AMD = 0x8C92;
+const unsigned GC3D_COMPRESSED_ATC_RGBA_EXPLICIT_ALPHA_AMD = 0x8C93;
+const unsigned GC3D_COMPRESSED_ATC_RGBA_INTERPOLATED_ALPHA_AMD = 0x87EE;
+
 #endif