Add chromium.win swarming dimensions

Bug: 880973
Change-Id: I905435107c3568d6e9f6c8eaf4c5fc9ec1173746
Reviewed-on: https://chromium-review.googlesource.com/1239622
Commit-Queue: Stephen Martinis <martiniss@chromium.org>
Reviewed-by: John Budorick <jbudorick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#593636}

testing/buildbot/swarming_mixins.pyl

@@ -51,4 +51,24 @@
       'gpu': 'none',
     }
   },
+  'win10': {
+    'dimensions': {
+      'os': 'Windows-10-15063',
+    }
+  },
+  'win7': {
+    'dimensions': {
+      'os': 'Windows-7-SP1',
+    }
+  },
+  'x86-32': {
+    'dimensions': {
+      'cpu': 'x86-32',
+    }
+  },
+  'x86-64': {
+    'dimensions': {
+      'cpu': 'x86-64',
+    }
+  },
 }

testing/buildbot/waterfalls.pyl

@@ -3610,18 +3610,30 @@
         },
       },
       'Win10 Tests x64': {
+        'swarming_mixins': [
+          'x86-64',
+          'win10',
+        ],
         'test_suites': {
           'gtest_tests': 'chromium_win_gtests',
           'isolated_scripts': 'win_specific_isolated_scripts',
         },
       },
       'Win10 Tests x64 (dbg)': {
+        'swarming_mixins': [
+          'x86-64',
+          'win10',
+        ],
         'test_suites': {
           'gtest_tests': 'chromium_win_gtests',
           'isolated_scripts': 'chromium_dbg_isolated_scripts',
         },
       },
       'Win7 (32) Tests': {
+        'swarming_mixins': [
+          'x86-32',
+          'win7',
+        ],
         'test_suites': {
           'gtest_tests': 'win7_32_bit_gtests',
         }