Infra side changes to add a 32 bit Windows 7 bot.

tests/masters_recipes_test.py

 #!/usr/bin/env python
 # Copyright 2014 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.
 
 import argparse
 import json
 import os
 import subprocess
 import sys
@@ skipping 62 matching lines @@
         'Mac10.9 Tests',
         'Mac10.11 Tests',
         'iOS_Device',
         'iOS_Device_(ninja)',
         'iOS_Simulator_(dbg)',
     ],
     'master.chromium.memory': [
         'Linux ASan Tests (sandboxed)',
     ],
     'master.chromium.win': [
+        'Win7 (32) Tests',
         'Win x64 Builder (dbg)',
     ],
 }
 
 
 def getBuilders(recipe_name):
   """Asks the given recipe to dump its BUILDERS dictionary.
 
   This must be implemented by the recipe in question.
   """
@@ skipping 144 matching lines @@
     exit_code = 1
     print 'Unused suppressions:'
     print '\n'.join(sorted(
         '\t%s:%s' % (b[0], b[1]) for b in unused_suppressions))
 
   return exit_code
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv[1:]))