Add field trial testing config for Scout study.

testing/variations/fieldtrial_testing_config.json

Index: testing/variations/fieldtrial_testing_config.json
diff --git a/testing/variations/fieldtrial_testing_config.json b/testing/variations/fieldtrial_testing_config.json
index c1884c5ca48445bf217bddda5072c900b8c6b138..aa596cc32a8c8ee1de3d1fa06935507d80b8c9be 100644
--- a/testing/variations/fieldtrial_testing_config.json
+++ b/testing/variations/fieldtrial_testing_config.json
@@ -1808,6 +1808,41 @@
             ]
         }
     ],
+    "SafeBrowsingScoutTransitionStudy": [
+        {
+            "platforms": [
+                "android",
+                "chromeos",
+                "linux",
+                "mac",
+                "win"
+            ],
+            "experiments": [
+                {
+                    "name": "CanShowScoutOptInGroup",

[Nathan Parker, 2016/12/09 18:54:15]

Last I heard, only the first experiment listed will be activated in tests.  So
this'll run bots w/ CanShowCoutOptInGroup.  Seems reasonable.

+                    "enable_features": [
+                        "CanShowScoutOptIn"
+                    ]
+                },
+                {
+                    "name": "OnlyShowScoutOptInGroup",
+                    "enable_features": [
+                        "OnlyShowScoutOptIn"
+                    ]
+                },
+                {
+                    "name": "Control",
+                    "disable_features": [
+                        "CanShowScoutOptIn",
+                        "OnlyShowScoutOptIn"
+                    ]
+                },
+                {
+                    "name": "Default"
+                }
+            ]
+        }
+    ],
     "SafeBrowsingUpdateFrequency": [
         {
             "platforms": [