Add "Infra" to the builder_name_schema

tools/buildbot_spec.py

 #
 # Copyright 2015 Google Inc.
 #
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 #
 
 #!/usr/bin/env python
 
 usage = '''
@@ skipping 27 matching lines @@
 # list so that we can ignore them.
 cov_skip = []
 
 cov_start = lineno()+1   # We care about coverage starting just past this def.
 def gyp_defines(builder_dict):
   gyp_defs = {}
 
   # skia_arch_type.
   if builder_dict['role'] == builder_name_schema.BUILDER_ROLE_BUILD:
     arch = builder_dict['target_arch']
-  elif builder_dict['role'] == builder_name_schema.BUILDER_ROLE_HOUSEKEEPER:
+  elif builder_dict['role'] in (builder_name_schema.BUILDER_ROLE_HOUSEKEEPER,
+                                builder_name_schema.BUILDER_ROLE_INFRA):
     arch = None
   else:
     arch = builder_dict['arch']
 
   arch_types = {
     'x86':      'x86',
     'x86_64':   'x86_64',
     'Arm7':     'arm',
     'Arm64':    'arm64',
     'Mips':     'mips32',
@@ skipping 347 matching lines @@
   if len(sys.argv) == 2 and sys.argv[1] == 'test':
     self_test()
     sys.exit(0)
 
   if len(sys.argv) != 3:
     print usage
     sys.exit(1)
 
   with open(sys.argv[1], 'w') as out:
     json.dump(get_builder_spec(sys.argv[2]), out)