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

scripts/slave/recipe_modules/chromium_tests/chromium_win.py

 # 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.
 
 from . import steps
 
 SPEC = {
   'settings': {
     'build_gs_bucket': 'chromium-win-archive',
     # WARNING: src-side runtest.py is only tested with chromium CQ builders.
@@ skipping 60 matching lines @@
       ],
       'parent_buildername': 'Win Builder',
       'testing': {
         'platform': 'win',
       },
       'enable_swarming': True,
       'swarming_dimensions': {
         'os': 'Windows-Vista-SP2',
       },
     },
+    'Win7 (32) Tests': {
+      'chromium_config': 'chromium',
+      'chromium_apply_config': ['ninja_confirm_noop'],
+      'gclient_config': 'chromium',
+      'chromium_config_kwargs': {
+        'BUILD_CONFIG': 'Release',
+        'TARGET_BITS': 32,
+      },
+      'bot_type': 'tester',
+      'test_generators': [
+        steps.generate_gtest,
+        steps.generate_script,
+        steps.generate_isolated_script,
+      ],
+      'parent_buildername': 'Win Builder',
+      'testing': {
+        'platform': 'win',
+      },
+      'enable_swarming': True,
+      'swarming_dimensions': {
+        'cpu': 'x86-32',
+        'os': 'Windows-7-SP1',
+      },
+    },
     'Win7 Tests (1)': {
       'chromium_config': 'chromium',
       'chromium_apply_config': ['ninja_confirm_noop'],
       'gclient_config': 'chromium',
       'chromium_config_kwargs': {
         'BUILD_CONFIG': 'Release',
         'TARGET_BITS': 32,
       },
       'bot_type': 'tester',
       'test_generators': [
@@ skipping 177 matching lines @@
         steps.generate_script,
         steps.generate_isolated_script,
       ],
       'enable_swarming': True,
       'testing': {
         'platform': 'win',
       },
     },
   },
 }