Reporting: Add Feature to fieldtrial_testing_config.json

testing/variations/fieldtrial_testing_config.json

 {
     "AlternateComponentUrls": [
         {
             "platforms": [
                 "android",
                 "chromeos",
                 "ios",
                 "linux",
                 "mac",
                 "win"
@@ skipping 2518 matching lines @@
                     "params": {
                         "sendingThreshold": "1.0"
                     }
                 },
                 {
                     "name": "DontShowAndDontSend"
                 }
             ]
         }
     ],
+    "Reporting": [

[rkaplow, 2017/05/24 17:31:49]

kind of nit - I'd prefer if this was more descriptive - "reporting" can be many
things.

+        {
+            "platforms": [
+                "android",
+                "chromeos",
+                "ios",
+                "linux",
+                "mac",
+                "win"
+            ],
+            "experiments": [
+                {
+                    "name": "ReportingEnabled",
+                    "enable_features": [
+                        "Reporting"
+                    ]
+                }
+            ]
+        }
+    ],
     "SRTPromptFieldTrial": [
         {
             "platforms": [
                 "win"
             ],
             "experiments": [
                 {
                     "name": "On"
                 }
             ]
@@ skipping 865 matching lines @@
                 {
                     "name": "Enabled",
                     "enable_features": [
                         "use-new-media-cache"
                     ]
                 }
             ]
         }
     ]
 }