Add APIs to manipulate Override APN.

Add APIs to add, update, query and remove Override APN. Add APIs to enable
Override APNs or query if Override APNs are currently enabled.

Bug: 68208301
Test: cts test in b/68208416

Change-Id: I65ebbb948d2ac4e31a73e1e761e32dc8ba1502c3
diff --git a/services/tests/servicestests/src/com/android/server/devicepolicy/DevicePolicyManagerTest.java b/services/tests/servicestests/src/com/android/server/devicepolicy/DevicePolicyManagerTest.java
index e8d6ed2..5825a8b7 100644
--- a/services/tests/servicestests/src/com/android/server/devicepolicy/DevicePolicyManagerTest.java
+++ b/services/tests/servicestests/src/com/android/server/devicepolicy/DevicePolicyManagerTest.java
@@ -78,6 +78,7 @@
 import android.security.KeyChain;
 import android.security.keystore.AttestationUtils;
 import android.telephony.TelephonyManager;
+import android.telephony.data.ApnSetting;
 import android.test.MoreAsserts;
 import android.test.suitebuilder.annotation.SmallTest;
 import android.util.ArraySet;
@@ -4610,6 +4611,23 @@
                 MockUtils.checkUserHandle(UserHandle.USER_SYSTEM));
     }
 
+    public void testOverrideApnAPIsFailWithPO() throws Exception {
+        setupProfileOwner();
+        ApnSetting apn = (new ApnSetting.Builder()).build();
+        assertExpectException(SecurityException.class, null, () ->
+                dpm.addOverrideApn(admin1, apn));
+        assertExpectException(SecurityException.class, null, () ->
+                dpm.updateOverrideApn(admin1, 0, apn));
+        assertExpectException(SecurityException.class, null, () ->
+                dpm.removeOverrideApn(admin1, 0));
+        assertExpectException(SecurityException.class, null, () ->
+                dpm.getOverrideApns(admin1));
+        assertExpectException(SecurityException.class, null, () ->
+                dpm.setOverrideApnsEnabled(admin1, false));
+        assertExpectException(SecurityException.class, null, () ->
+                dpm.isOverrideApnEnabled(admin1));
+    }
+
     private void verifyCanGetOwnerInstalledCaCerts(
             final ComponentName caller, final DpmMockContext callerContext) throws Exception {
         final String alias = "cert";