[Analytics] logging for default opt in.

PiperOrigin-RevId: 515561927

proto/sharing_enums.proto

@@ -27,7 +27,7 @@ option objc_class_prefix = "GNSHP";
 // in NearbyClearcutLogger (for android, or clearcut_event_logger as the
 // equivalence for Windows) for all events (may exclude settings), and
 // session_id for a pair of events (start and end of a session).
-// Next id: 56
+// Next id: 57
 enum EventType {
   UNKNOWN_EVENT_TYPE = 0;
 
@@ -208,6 +208,9 @@ enum EventType {
   // Used only for Windows App now.
   PREFERENCES_USAGE = 55;
 
+  // Default opt in
+  DEFAULT_OPT_IN = 56;
+
   // LINT.ThenChange(//depot/google3/location/nearby/proto/nearby_event_codes.proto:SharingEventCode)
 }