Add VpnManger API surface

This change adds the VpnManager, which will be used by apps to install
profiles for all platform VPN types (currently only IKEv2).

Bug: 143325939
Test: Compiles, FrameworksNetTests passing.
Change-Id: I57f854d0a5b18358f3541c24ca0cd8aed03fd7a1

tests/net/java/android/net/VpnManagerTest.java

@@ -0,0 +1,83 @@
+/*
+ * Copyright (C) 2019 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;
+
+import static org.mockito.Mockito.mock;
+
+import android.test.mock.MockContext;
+
+import androidx.test.filters.SmallTest;
+import androidx.test.runner.AndroidJUnit4;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+/** Unit tests for {@link VpnManager}. */
+@SmallTest
+@RunWith(AndroidJUnit4.class)
+public class VpnManagerTest {
+    private static final String VPN_PROFILE_KEY = "KEY";
+
+    private IConnectivityManager mMockCs;
+    private VpnManager mVpnManager;
+    private final MockContext mMockContext =
+            new MockContext() {
+                @Override
+                public String getOpPackageName() {
+                    return "fooPackage";
+                }
+            };
+
+    @Before
+    public void setUp() throws Exception {
+        mMockCs = mock(IConnectivityManager.class);
+        mVpnManager = new VpnManager(mMockContext, mMockCs);
+    }
+
+    @Test
+    public void testProvisionVpnProfile() throws Exception {
+        try {
+            mVpnManager.provisionVpnProfile(mock(PlatformVpnProfile.class));
+        } catch (UnsupportedOperationException expected) {
+        }
+    }
+
+    @Test
+    public void testDeleteProvisionedVpnProfile() throws Exception {
+        try {
+            mVpnManager.deleteProvisionedVpnProfile();
+        } catch (UnsupportedOperationException expected) {
+        }
+    }
+
+    @Test
+    public void testStartProvisionedVpnProfile() throws Exception {
+        try {
+            mVpnManager.startProvisionedVpnProfile();
+        } catch (UnsupportedOperationException expected) {
+        }
+    }
+
+    @Test
+    public void testStopProvisionedVpnProfile() throws Exception {
+        try {
+            mVpnManager.stopProvisionedVpnProfile();
+        } catch (UnsupportedOperationException expected) {
+        }
+    }
+}