Add GL_CHROMIUM_screen_space_antialiasing to support alternative AA

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 2115 matching lines @@
 # id_mapping:   A list of resource type names whose client side IDs need to be
 #               mapped to service side IDs.  This is only used for unsafe APIs.
 
 _FUNCTION_INFO = {
   'ActiveTexture': {
     'decoder_func': 'DoActiveTexture',
     'unit_test': False,
     'impl_func': False,
     'client_test': False,
   },
+  'ApplyScreenSpaceAntialiasing': {

[Ken Russell (switch to Gerrit), 2015/08/28 02:34:03]

CHROMIUM extension suffix here.

+    'decoder_func': 'DoApplyScreenSpaceAntialiasing',

[Ken Russell (switch to Gerrit), 2015/08/28 02:34:03]

Same here.

+    'extension_flag': 'chromium_screen_space_antialiasing',
+    'unit_test': False,
+    'client_test': False,
+  },
   'AttachShader': {'decoder_func': 'DoAttachShader'},
   'BindAttribLocation': {
     'type': 'GLchar',
     'data_transfer_methods': ['bucket'],
     'needs_size': True,
   },
   'BindBuffer': {
     'type': 'Bind',
     'decoder_func': 'DoBindBuffer',
     'gen_func': 'GenBuffersARB',
@@ skipping 8907 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:]))