Shard interactive_ui_tests with network service 2x.

It's too slow on Windows, and on Windows we shard it.

Change-Id: I2747e7b5bc3b1fa4adf7e574f0c3a875dc3655e9
Reviewed-on: https://chromium-review.googlesource.com/1090314Reviewed-by: Chong Zhang <chongz@chromium.org>
Commit-Queue: John Abd-El-Malek <jam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#565310}

testing/buildbot/chromium.fyi.json

@@ -4346,7 +4346,8 @@
         ],
         "name": "network_service_interactive_ui_tests",
         "swarming": {
-          "can_use_on_swarming_builders": true
+          "can_use_on_swarming_builders": true,
+          "shards": 2
         },
         "test": "interactive_ui_tests"
       }
@@ -4484,7 +4485,8 @@
         ],
         "name": "network_service_interactive_ui_tests",
         "swarming": {
-          "can_use_on_swarming_builders": true
+          "can_use_on_swarming_builders": true,
+          "shards": 2
         },
         "test": "interactive_ui_tests"
       },
@@ -8637,7 +8639,8 @@
         ],
         "name": "network_service_interactive_ui_tests",
         "swarming": {
-          "can_use_on_swarming_builders": true
+          "can_use_on_swarming_builders": true,
+          "shards": 2
         },
         "test": "interactive_ui_tests"
       },

testing/buildbot/chromium.linux.json

@@ -1089,7 +1089,8 @@
         ],
         "name": "network_service_interactive_ui_tests",
         "swarming": {
-          "can_use_on_swarming_builders": true
+          "can_use_on_swarming_builders": true,
+          "shards": 2
         },
         "test": "interactive_ui_tests"
       },
@@ -1913,7 +1914,8 @@
         ],
         "name": "network_service_interactive_ui_tests",
         "swarming": {
-          "can_use_on_swarming_builders": true
+          "can_use_on_swarming_builders": true,
+          "shards": 2
         },
         "test": "interactive_ui_tests"
       },
@@ -2526,7 +2528,8 @@
         ],
         "name": "network_service_interactive_ui_tests",
         "swarming": {
-          "can_use_on_swarming_builders": true
+          "can_use_on_swarming_builders": true,
+          "shards": 2
         },
         "test": "interactive_ui_tests"
       },
@@ -3491,7 +3494,8 @@
             {
               "os": "Ubuntu-16.04"
             }
-          ]
+          ],
+          "shards": 2
         },
         "test": "interactive_ui_tests"
       },

testing/buildbot/test_suites.pyl

@@ -1766,6 +1766,9 @@
       'args': [
         '--enable-features=NetworkService'
       ],
+      'swarming': {
+        'shards': 2,
+      },
       'test': 'interactive_ui_tests',
     },
   },