gpu: Add ARB_occlusion_query support.

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 1354 matching lines @@
     'type': 'GLenum',
     'is_complete': True,
     'valid': [
       'GL_CURRENT_QUERY_EXT',
     ],
   },
   'QueryTarget': {
     'type': 'GLenum',
     'is_complete': True,
     'valid': [
+      'GL_SAMPLES_PASSED_ARB',
       'GL_ANY_SAMPLES_PASSED_EXT',
       'GL_ANY_SAMPLES_PASSED_CONSERVATIVE_EXT',
       'GL_COMMANDS_ISSUED_CHROMIUM',
       'GL_LATENCY_QUERY_CHROMIUM',
       'GL_ASYNC_PIXEL_PACK_COMPLETED_CHROMIUM',
       'GL_COMMANDS_COMPLETED_CHROMIUM',
     ],
   },
   'RenderBufferParameter': {
     'type': 'GLenum',
@@ skipping 9826 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:]))