gpu: Add calling convention for win32

gpu/command_buffer/build_gles2_cmd_buffer.py

 #!/usr/bin/env python
 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """code generator for GLES2 command buffers."""
 
 import itertools
 import os
 import os.path
@@ skipping 4706 matching lines @@
   def WriteGLES2ImplementationDeclaration(self, func, file):
     """Writes the GLES2 Implemention declaration."""
     impl_decl = func.GetInfo('impl_decl')
     if impl_decl == None or impl_decl == True:
       file.Write("%s %s(%s) override;\n" %
                  (func.return_type, func.original_name,
                   func.MakeTypedOriginalArgString("")))
       file.Write("\n")
 
   def WriteGLES2CLibImplementation(self, func, file):
-    file.Write("%s GLES2%s(%s) {\n" %
+    file.Write("%s GL_APIENTRY GLES2%s(%s) {\n" %
                (func.return_type, func.name,
                 func.MakeTypedOriginalArgString("")))
     result_string = "return "
     if func.return_type == "void":
       result_string = ""
     file.Write("  %sgles2::GetGLContext()->%s(%s);\n" %
                (result_string, func.original_name,
                 func.MakeOriginalArgString("")))
     file.Write("}\n")
 
@@ skipping 6543 matching lines @@
   Format(gen.generated_cpp_filenames)
 
   if gen.errors > 0:
     print "%d errors" % gen.errors
     return 1
   return 0
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv[1:]))