Internal API for system apps to determine default network for other apps

Callers with CONNECTIVITY_INTERNAL permission can read off the netId
that an application is assigned to by default.

Necessary for making connections as the default network for a client
app eg. when downloading stuff on its behalf.

Bug: 27074270
Change-Id: I8d35e8e99126875f55f3c545090326f3e9be43fb
diff --git a/core/java/android/net/IConnectivityManager.aidl b/core/java/android/net/IConnectivityManager.aidl
index 1a9c9ea..c897c45 100644
--- a/core/java/android/net/IConnectivityManager.aidl
+++ b/core/java/android/net/IConnectivityManager.aidl
@@ -44,6 +44,7 @@
 interface IConnectivityManager
 {
     Network getActiveNetwork();
+    Network getActiveNetworkForUid(int uid);
     NetworkInfo getActiveNetworkInfo();
     NetworkInfo getActiveNetworkInfoForUid(int uid);
     NetworkInfo getNetworkInfo(int networkType);