Add support for all blendmodes if we have GL_KHR_blend_equation_advanced.

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 1528 matching lines @@
     },
   },
   'BlendFunc': {
     'type': 'StateSetRGBAlpha',
     'state': 'BlendFunc',
   },
   'BlendFuncSeparate': {
     'type': 'StateSet',
     'state': 'BlendFunc',
   },
+  'BlendBarrierKHR': {
+    'gl_test_func': 'glBlendBarrierKHR',
+    'extension': True,
+    'extension_flag': 'blend_equation_advanced',
+    'client_test': False,
+  },
   'SampleCoverage': {'decoder_func': 'DoSampleCoverage'},
   'StencilFunc': {
     'type': 'StateSetFrontBack',
     'state': 'StencilFunc',
   },
   'StencilFuncSeparate': {
     'type': 'StateSetFrontBackSeparate',
     'state': 'StencilFunc',
   },
   'StencilOp': {
@@ skipping 7067 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:]))