Create TunnelConnectionParams interface

TunnelConnectionParams represents configurations for setting up a
secure encrypted tunnel with a remote endpoint. TunnelConnectionParams
will be used to configure a VCN and will be used for VPN configuration
in the future.

Bug: 180664474
Test: make update-api
Change-Id: Ic8e5c8535e84971517f16c54ce8b8645cfc7f944

core/api/current.txt

@@ -25138,6 +25138,9 @@ package android.net {
     field public static final int UNSUPPORTED = -1; // 0xffffffff
   }
 
+  public interface TunnelConnectionParams {
+  }
+
   public abstract class Uri implements java.lang.Comparable<android.net.Uri> android.os.Parcelable {
     method public abstract android.net.Uri.Builder buildUpon();
     method public int compareTo(android.net.Uri);

core/java/android/net/TunnelConnectionParams.java

@@ -0,0 +1,29 @@
+/*
+ * Copyright (C) 2021 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package android.net;
+
+/**
+ * TunnelConnectionParams represents a configuration to set up a tunnel connection.
+ *
+ * <p>Concrete implementations for a control plane protocol should implement this interface.
+ * Subclasses should be immutable data classes containing connection, authentication and
+ * authorization parameters required to establish a tunnel connection.
+ *
+ * @see android.net.ipsec.ike.IkeTunnelConnectionParams
+ */
+// TODO:b/186071626 Remove TunnelConnectionParams when non-updatable API stub can resolve
+// IkeTunnelConnectionParams
+public interface TunnelConnectionParams {}