Create RestrictedDashboardFragment.

RestrictedDashboardFragment has all the same logic coming from
RestrcitedSettingsFragment but extends from DashboardFragment.
As a result, we could use preferenceController in child class of
RestrictedDashboardFragment.

This cl also make DeviceListPreferenceFragment as child of
RestrictedDashboardFragment, which enfluences the bluetooth page.

Bug: 38041586
Test: Build
Change-Id: I01395d506176c5cc584948478f7ca16c1c7c7045

src/com/android/settings/bluetooth/DevicePickerFragment.java

@@ -29,16 +29,20 @@ import android.view.MenuItem;
 
 import com.android.internal.logging.nano.MetricsProto.MetricsEvent;
 import com.android.settings.R;
+import com.android.settings.core.PreferenceController;
 import com.android.settingslib.bluetooth.CachedBluetoothDevice;
 
 import static android.os.UserManager.DISALLOW_CONFIG_BLUETOOTH;
 
+import java.util.List;
+
 /**
  * BluetoothSettings is the Settings screen for Bluetooth configuration and
  * connection management.
  */
 public final class DevicePickerFragment extends DeviceListPreferenceFragment {
     private static final int MENU_ID_REFRESH = Menu.FIRST;
+    private static final String TAG = "DevicePickerFragment";
 
     public DevicePickerFragment() {
         super(null /* Not tied to any user restrictions. */);
@@ -51,8 +55,6 @@ public final class DevicePickerFragment extends DeviceListPreferenceFragment {
 
     @Override
     void addPreferencesForActivity() {
-        addPreferencesFromResource(R.xml.device_picker);
-
         Intent intent = getActivity().getIntent();
         mNeedAuth = intent.getBooleanExtra(BluetoothDevicePicker.EXTRA_NEED_AUTH, false);
         setFilter(intent.getIntExtra(BluetoothDevicePicker.EXTRA_FILTER_TYPE,
@@ -150,6 +152,21 @@ public final class DevicePickerFragment extends DeviceListPreferenceFragment {
         }
     }
 
+    @Override
+    protected String getLogTag() {
+        return TAG;
+    }
+
+    @Override
+    protected int getPreferenceScreenResId() {
+        return R.xml.device_picker;
+    }
+
+    @Override
+    protected List<PreferenceController> getPreferenceControllers(Context context) {
+        return null;
+    }
+
     private void sendDevicePickedIntent(BluetoothDevice device) {
         Intent intent = new Intent(BluetoothDevicePicker.ACTION_DEVICE_SELECTED);
         intent.putExtra(BluetoothDevice.EXTRA_DEVICE, device);