Add lost prefController to WifiTetherSettings

One controller is lost during a refactor(ag/4774003), this CL adds
it back.

Change-Id: Ie50a3ac009f302d4fd7a179117fe026031cc1ae8
Fixes: 122235175
Test: RunSettingsRoboTests

src/com/android/settings/wifi/tether/WifiTetherSettings.java

@@ -178,6 +178,8 @@ public class WifiTetherSettings extends RestrictedDashboardFragment
         controllers.add(new WifiTetherSecurityPreferenceController(context, listener));
         controllers.add(new WifiTetherPasswordPreferenceController(context, listener));
         controllers.add(new WifiTetherApBandPreferenceController(context, listener));
+        controllers.add(
+                new WifiTetherAutoOffPreferenceController(context, KEY_WIFI_TETHER_AUTO_OFF));
 
         return controllers;
     }

tests/robotests/src/com/android/settings/wifi/tether/WifiTetherSettingsTest.java

@@ -35,6 +35,9 @@ import android.os.UserHandle;
 import android.os.UserManager;
 import android.widget.TextView;
 
+import androidx.fragment.app.FragmentActivity;
+import androidx.preference.PreferenceScreen;
+
 import com.android.settings.testutils.FakeFeatureFactory;
 import com.android.settings.testutils.shadow.ShadowWifiManager;
 
@@ -51,15 +54,13 @@ import org.robolectric.util.ReflectionHelpers;
 import java.util.ArrayList;
 import java.util.List;
 
-import androidx.fragment.app.FragmentActivity;
-import androidx.preference.PreferenceScreen;
-
 @RunWith(RobolectricTestRunner.class)
 @Config(shadows = {ShadowWifiManager.class})
 public class WifiTetherSettingsTest {
     private static final String[] WIFI_REGEXS = {"wifi_regexs"};
 
     private Context mContext;
+    private WifiTetherSettings mWifiTetherSettings;
 
     @Mock
     private ConnectivityManager mConnectivityManager;
@@ -75,6 +76,8 @@ public class WifiTetherSettingsTest {
                 .when(mContext).getSystemService(Context.CONNECTIVITY_SERVICE);
         doReturn(WIFI_REGEXS).when(mConnectivityManager).getTetherableWifiRegexs();
         doReturn(mUserManager).when(mContext).getSystemService(Context.USER_SERVICE);
+
+        mWifiTetherSettings = new WifiTetherSettings();
     }
 
     @Test
@@ -136,6 +139,15 @@ public class WifiTetherSettingsTest {
         verify(screen).removeAll();
     }
 
+    @Test
+    public void createPreferenceControllers_hasAutoOffPreference() {
+        assertThat(mWifiTetherSettings.createPreferenceControllers(mContext)
+                .stream()
+                .filter(controller -> controller instanceof WifiTetherAutoOffPreferenceController)
+                .count())
+                .isEqualTo(1);
+    }
+
     private void setupIsTetherAvailable(boolean returnValue) {
         when(mConnectivityManager.isTetheringSupported()).thenReturn(true);