Send VPN manager event when VPN is deactivated

Bug: 191413541
Test: atest FrameworksNetTests:VpnTest
Change-Id: I35fc360204f0227a969ff2b12a4c47f701a55a9c

services/core/java/com/android/server/connectivity/Vpn.java

@@ -1110,6 +1110,17 @@ public class Vpn {
                 if (!VpnConfig.LEGACY_VPN.equals(mPackage)) {
                     mAppOpsManager.finishOp(
                             AppOpsManager.OPSTR_ESTABLISH_VPN_MANAGER, mOwnerUID, mPackage, null);
+                    // The underlying network, NetworkCapabilities and LinkProperties are not
+                    // necessary to send to VPN app since the purpose of this event is to notify
+                    // VPN app that VPN is deactivated by the user.
+                    // TODO(b/230548427): Remove SDK check once VPN related stuff are decoupled from
+                    //  ConnectivityServiceTest.
+                    if (SdkLevel.isAtLeastT()) {
+                        sendEventToVpnManagerApp(VpnManager.CATEGORY_EVENT_DEACTIVATED_BY_USER,
+                                -1 /* errorClass */, -1 /* errorCode*/, mPackage,
+                                getSessionKeyLocked(), makeVpnProfileStateLocked(),
+                                null /* underlyingNetwork */, null /* nc */, null /* lp */);
+                    }
                 }
                 // cleanupVpnStateLocked() is called from mVpnRunner.exit()
                 mVpnRunner.exit();