Add feature type TYPE_INTERNAL_KILL_SWITCH

Change-Id: I766aada0cad3666e8f61180e4a2f5af2ed77fdb6
diff --git a/api_proto/kill_switch_objects.proto b/api_proto/kill_switch_objects.proto
index 041291f..128371b 100644
--- a/api_proto/kill_switch_objects.proto
+++ b/api_proto/kill_switch_objects.proto
@@ -12,6 +12,7 @@
     TYPE_UNKNOWN = 0;
     TYPE_EXPERIMENT = 1;
     TYPE_OPTION = 2;
+    TYPE_INTERNAL_KILL_SWITCH = 3;
     TYPE_DEPRECATED = 10;
   }
   Type type = 3;