Add ViewsSimplifiedFullscreenUI to the fieldtrial testing config on Mac

testing/variations/fieldtrial_testing_config_mac.json

 {
     "AutofillClassifier": [
         {
             "group_name": "Enabled"
         }
     ],
     "AutofillFieldMetadata": [
         {
             "group_name": "Enabled"
         }
@@ skipping 214 matching lines @@
         }
     ],
     "VarationsServiceControl": [
         {
             "group_name": "Interval_30min",
             "params": {
                 "fetch_period_min": "30"
             }
         }
     ],
+    "ViewsSimplifiedFullscreenUI": [
+        {
+            "group_name": "Enabled"

[Ilya Sherman, 2016/02/18 22:12:29]

You probably need to list enable_features here.

[tapted, 2016/02/23 04:28:37]

Ah! I thought it looked too easy :). Done.

+        },
+        {
+            "group_name": "Control"
+        }

[Ilya Sherman, 2016/02/18 22:12:29]

No need to list the control group -- just the non-default group.

[tapted, 2016/02/23 04:28:37]

Done.

+    ],
     "WebFontsIntervention": [
         {
             "group_name": "Enabled"
         }
     ],
     "WebRTC-LocalIPPermissionCheck": [
         {
             "group_name": "Enabled"
         }
     ],
     "WebRTC-PeerConnectionDTLS1.2": [
         {
             "group_name": "Enabled"
         }
     ]
 }