swarmbucket: add support for blamelist

appengine/cr-buildbucket/swarming/test/swarming_test.py

Index: appengine/cr-buildbucket/swarming/test/swarming_test.py
diff --git a/appengine/cr-buildbucket/swarming/test/swarming_test.py b/appengine/cr-buildbucket/swarming/test/swarming_test.py
index 5523e8673943a3ac3953427bf41335455efddccb..3d660ba957c48f7c958cfd5194e9bae7779a7861 100755
--- a/appengine/cr-buildbucket/swarming/test/swarming_test.py
+++ b/appengine/cr-buildbucket/swarming/test/swarming_test.py
@@ -146,7 +146,10 @@ class SwarmingTest(testing.AppengineTestCase):
         },
         'properties': {
           'a': 'b',
-        }
+        },
+        'changes': [{
+          'author': {'email': 'bob@example.com'},
+        }]
       },
     )
 
@@ -209,6 +212,7 @@ class SwarmingTest(testing.AppengineTestCase):
           '-recipe', 'recipe',
           '-properties', json.dumps({
             'a': 'b',
+            'blamelist': ['bob@example.com'],
             'buildername': 'builder',
             'predefined-property': 'x',
           }, sort_keys=True)