Add EnhancedBookmarks experiment groups to fieldtrial json.

testing/variations/fieldtrial_testing_config_android.json

 {
     "AndroidSessionNotifications": [
         {
             "group_name": "Disabled"
         }
     ],
     "AutofillClassifier": [
         {
             "group_name": "Enabled"
         }
@@ skipping 85 matching lines @@
             }
         }
     ],
     "EnableMediaThreadForMediaPlayback": [
         {
             "group_name": "Enabled"
         }
     ],
     "EnhancedBookmarks": [
         {
+            "group_name": "Launch EnableEnhancedBookmarks",
+            "params": {
+                "id": "Fake_id_to_trigger_experiment_code"
+            }
+        },
+        {
+            "group_name": "Launch Control"
+        },
+        {
             "group_name": "EnableEnhancedBookmarks",
             "params": {
                 "id": "Fake_id_to_trigger_experiment_code"
             }
         },
         {
             "group_name": "EnableEnhancedBookmarksGrid",
             "params": {
                 "DefaultViewMode": "Grid",
                 "id": "Fake_id_to_trigger_experiment_code"
@@ skipping 207 matching lines @@
         {
             "group_name": "Enabled"
         }
     ],
     "WebRTC-PeerConnectionDTLS1.2": [
         {
             "group_name": "Enabled"
         }
     ]
 }