gpu: support immutable texture on Linux Mesa driver and GLES3.

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 602 matching lines @@
 { 'return_type': 'void',
   'names': ['glTexParameterfv'],
   'arguments': 'GLenum target, GLenum pname, const GLfloat* params', },
 { 'return_type': 'void',
   'names': ['glTexParameteri'],
   'arguments': 'GLenum target, GLenum pname, GLint param', },
 { 'return_type': 'void',
   'names': ['glTexParameteriv'],
   'arguments': 'GLenum target, GLenum pname, const GLint* params', },
 { 'return_type': 'void',
-  'names': ['glTexStorage2DEXT'],
+  'names': ['glTexStorage2DEXT', 'glTexStorage2D'],
   'arguments': 'GLenum target, GLsizei levels, GLenum internalformat, '
                'GLsizei width, GLsizei height', },
 { 'return_type': 'void',
   'names': ['glTexSubImage2D'],
   'arguments':
      'GLenum target, GLint level, GLint xoffset, GLint yoffset, '
      'GLsizei width, GLsizei height, GLenum format, GLenum type, '
      'const void* pixels', },
 { 'return_type': 'void',
   'names': ['glUniform1f'],
@@ skipping 1411 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:]))