Add support for repeated keys in TaskRequest.

appengine/swarming/handlers_bot_test.py

Index: appengine/swarming/handlers_bot_test.py
diff --git a/appengine/swarming/handlers_bot_test.py b/appengine/swarming/handlers_bot_test.py
index 17ed2939c7d7f21e34e33d6e6084bc3a061823b1..627f5d0b59cd044b093ce8799ed8adf744471fdf 100755
--- a/appengine/swarming/handlers_bot_test.py
+++ b/appengine/swarming/handlers_bot_test.py
@@ -296,10 +296,10 @@ class BotApiTest(test_env_handlers.AppTestBase):
           u'server': u'https://chrome-infra-packages.appspot.com',
         },
         u'command': [u'python', u'run_test.py'],
-        u'dimensions': {
-          u'os': u'Amiga',
-          u'pool': u'default',
-        },
+        u'dimensions': [
+          [u'os', u'Amiga'],
+          [u'pool', u'default'],
+        ],
         u'env': {},
         u'extra_args': [],
         u'grace_period': 30,
@@ -365,10 +365,10 @@ class BotApiTest(test_env_handlers.AppTestBase):
           u'server': u'https://chrome-infra-packages.appspot.com',
         },
         u'command': [u'python', u'run_test.py'],
-        u'dimensions': {
-          u'os': u'Amiga',
-          u'pool': u'default',
-        },
+        u'dimensions': [
+          [u'os', u'Amiga'],
+          [u'pool', u'default'],
+        ],
         u'env': {},
         u'extra_args': [],
         u'grace_period': 30,
@@ -419,10 +419,10 @@ class BotApiTest(test_env_handlers.AppTestBase):
           u'server': u'https://chrome-infra-packages.appspot.com',
         },
         u'command': [u'python', u'run_test.py'],
-        u'dimensions': {
-          u'os': u'Amiga',
-          u'pool': u'default',
-        },
+        u'dimensions': [
+          [u'os', u'Amiga'],
+          [u'pool', u'default'],
+        ],
         u'env': {},
         u'extra_args': [],
         u'grace_period': 30,
@@ -512,10 +512,10 @@ class BotApiTest(test_env_handlers.AppTestBase):
           u'server': u'https://chrome-infra-packages.appspot.com',
         },
         u'command': [],
-        u'dimensions': {
-          u'os': u'Amiga',
-          u'pool': u'default',
-        },
+        u'dimensions': [
+          [u'os', u'Amiga'],
+          [u'pool', u'default'],
+        ],
         u'env': {},
         u'extra_args': [],
         u'hard_timeout': 3600,
@@ -671,10 +671,10 @@ class BotApiTest(test_env_handlers.AppTestBase):
           u'server': u'https://chrome-infra-packages.appspot.com',
         },
         u'command': [],
-        u'dimensions': {
-          u'os': u'Amiga',
-          u'pool': u'default',
-        },
+        u'dimensions': [
+          [u'os', u'Amiga'],
+          [u'pool', u'default'],
+        ],
         u'env': {},
         u'extra_args': [],
         u'hard_timeout': 3600,