Change GLGetProcAddress typedef to function returning function pointer

ui/gl/generate_bindings.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 GL/GLES extension wrangler."""
 
 import optparse
 import os
 import collections
@@ skipping 2958 matching lines @@
   # Write an 'invalid' function to catch code calling through uninitialized
   # function pointers or trying to interpret the return value of
   # GLProcAddress().
   file.write('\n')
   file.write('static void MockInvalidFunction() {\n')
   file.write('  NOTREACHED();\n')
   file.write('}\n')
 
   # Write a function to lookup a mock GL function based on its name.
   file.write('\n')
-  file.write('void* GL_BINDING_CALL ' +
+  file.write('GLFunctionPointerType GL_BINDING_CALL ' +
       'MockGLInterface::GetGLProcAddress(const char* name) {\n')
   for key in sorted_function_names:
     name = uniquely_named_functions[key]['name']
     file.write('  if (strcmp(name, "%s") == 0)\n' % name)
-    file.write('    return reinterpret_cast<void*>(Mock_%s);\n' % name)
+    file.write(
+        '    return reinterpret_cast<GLFunctionPointerType>(Mock_%s);\n' %
+            name)
   # Always return a non-NULL pointer like some EGL implementations do.
-  file.write('  return reinterpret_cast<void*>(&MockInvalidFunction);\n')
+  file.write('  return reinterpret_cast<GLFunctionPointerType>('
+             '&MockInvalidFunction);\n')
   file.write('}\n')
 
   file.write('\n')
   file.write('}  // namespace gl\n')
 
 def GenerateEnumUtils(out_file, input_filenames):
   enum_re = re.compile(r'\#define\s+(GL_[a-zA-Z0-9_]+)\s+([0-9A-Fa-fx]+)')
   dict = {}
   for fname in input_filenames:
     lines = open(fname).readlines()
@@ skipping 385 matching lines @@
     header_file = open(
         os.path.join(directory, 'gl_stub_autogen_gl.cc'), 'wb')
     GenerateStubSource(header_file, GL_FUNCTIONS)
     header_file.close()
     ClangFormat(header_file.name)
   return 0
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv[1:]))