Implement OES_texture_float_linear and OES_texture_half_float_linear extensions in WebGL.

Source/core/html/canvas/WebGLExtension.h

 /*
  * 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
@@ skipping 31 matching lines @@
         OESTextureHalfFloatName,
         OESStandardDerivativesName,
         OESVertexArrayObjectName,
         WebGLDebugRendererInfoName,
         WebGLDebugShadersName,
         WebGLCompressedTextureS3TCName,
         WebGLDepthTextureName,
         OESElementIndexUintName,
         WebGLCompressedTextureATCName,
         WebGLCompressedTexturePVRTCName,
+        OESTextureFloatLinearName,
+        OESTextureHalfFloatLinearName,
     };
 
     void ref() { m_context->ref(); }
     void deref() { m_context->deref(); }
     WebGLRenderingContext* context() { return m_context; }
 
     virtual ~WebGLExtension();
     virtual ExtensionName getName() const = 0;
 
 protected:
     WebGLExtension(WebGLRenderingContext*);
     WebGLRenderingContext* m_context;
 };
 
 } // namespace WebCore
 
 #endif // WebGLExtension_h