make the client browse for appropriate mdns services

This CL makes it so the client looks for the adb secure pairing
and adb secure connect services. Nothing else should happen,
but this should be useful to see if the right packet traffic for
discoverability is happening.

Bug: 111434128, 119490749

Test: N/A
Exempt-From-Owner-Approval: already approved
Change-Id: I266bdb8526cf39bbfa131344dca2b1bb14c14a7b
diff --git a/adb/adb_mdns.h b/adb/adb_mdns.h
index 33e2e08..e223b1b 100644
--- a/adb/adb_mdns.h
+++ b/adb/adb_mdns.h
@@ -30,5 +30,6 @@
 };
 
 const int kNumADBDNSServices = arraysize(kADBDNSServices);
+const int kADBTransportServiceRefIndex = 0;
 
 #endif