Update from https://crrev.com/304418

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 577 matching lines @@
   'names': ['glLineWidth'],
   'arguments': 'GLfloat width', },
 { 'return_type': 'void',
   'names': ['glLinkProgram'],
   'arguments': 'GLuint program', },
 { 'return_type': 'void*',
   'known_as': 'glMapBuffer',
   'names': ['glMapBufferOES', 'glMapBuffer'],
   'arguments': 'GLenum target, GLenum access', },
 { 'return_type': 'void*',
-  'names': ['glMapBufferRange'],
+  'known_as': 'glMapBufferRange',
+  'versions': [{ 'name': 'glMapBufferRange',
+                 'gl_versions': ['gl3', 'gl4', 'es3'] },
+               { 'name': 'glMapBufferRange',
+                 'extensions': ['GL_ARB_map_buffer_range'] },
+               { 'name': 'glMapBufferRangeEXT',
+                 'extensions': ['GL_EXT_map_buffer_range'] }],
   'arguments':
-      'GLenum target, GLintptr offset, GLsizeiptr length, GLenum access', },
+      'GLenum target, GLintptr offset, GLsizeiptr length, GLbitfield access', },
 { 'return_type': 'void',
   'known_as': 'glMatrixLoadfEXT',
   'versions': [{ 'name': 'glMatrixLoadfEXT',
                  'gl_versions': ['gl4'],
                  'extensions': ['GL_EXT_direct_state_access'] },
                { 'name': 'glMatrixLoadfEXT',
                  'gl_versions': ['es3'],
                  'extensions': ['GL_NV_path_rendering'] }],
   'arguments': 'GLenum matrixMode, const GLfloat* m' },
 { 'return_type': 'void',
@@ skipping 1520 matching lines @@
 
     source_file = open(os.path.join(directory, 'gl_bindings_autogen_mock.cc'),
                        'wb')
     GenerateMockBindingsSource(source_file, GL_FUNCTIONS)
     source_file.close()
   return 0
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv[1:]))