Expose VPN_UID

ConnectivityService will be a part of mainline module, so it
cannot access hidden API. Expose VPN_UID for ConnectivityService
to access.

Bug: 170598012
Test: m
Change-Id: I9f74fb97ba27e5feacf1820cf75e28ad73516d7d
diff --git a/core/api/module-lib-current.txt b/core/api/module-lib-current.txt
index 992b57f..a21ce79 100644
--- a/core/api/module-lib-current.txt
+++ b/core/api/module-lib-current.txt
@@ -109,6 +109,10 @@
     method public default int getStability();
   }
 
+  public class Process {
+    field public static final int VPN_UID = 1016; // 0x3f8
+  }
+
   public class StatsServiceManager {
     method @NonNull public android.os.StatsServiceManager.ServiceRegisterer getStatsCompanionServiceRegisterer();
     method @NonNull public android.os.StatsServiceManager.ServiceRegisterer getStatsManagerServiceRegisterer();