[Provider Model] Add connected ethernet network preference

- Show the preference if connected to ethernet network

- Hide the preference if not connected to ethernet network

- Screenshot:
  https://screenshot.googleplex.com/5ZkZXnTr9Hcfsyt

Bug: 176796623
Test: manual test
- atest ConnectedEthernetNetworkControllerTest
- make RunSettingsRoboTests ROBOTEST_FILTER=NetworkProviderSettingsTest

Change-Id: I0f062eb2ee4898976f5e7a1c3f2c4061b60a3126

src/com/android/settings/network/NetworkProviderSettings.java

@@ -207,6 +207,8 @@ public class NetworkProviderSettings extends RestrictedSettingsFragment
             mViewAirplaneModeNetworksButtonPreference;
     @VisibleForTesting
     LayoutPreference mResetInternetPreference;
+    @VisibleForTesting
+    ConnectedEthernetNetworkController mConnectedEthernetNetworkController;
 
     /**
      * Mobile networks list for provider model
@@ -267,6 +269,7 @@ public class NetworkProviderSettings extends RestrictedSettingsFragment
         }
         addNetworkMobileProviderController();
         addViewAirplaneModeNetworksButtonController();
+        addConnectedEthernetNetworkController();
     }
 
     private void addNetworkMobileProviderController() {
@@ -287,6 +290,14 @@ public class NetworkProviderSettings extends RestrictedSettingsFragment
         mViewAirplaneModeNetworksButtonPreference.displayPreference(getPreferenceScreen());
     }
 
+    private void addConnectedEthernetNetworkController() {
+        if (mConnectedEthernetNetworkController == null) {
+            mConnectedEthernetNetworkController =
+                    new ConnectedEthernetNetworkController(getContext(), getSettingsLifecycle());
+        }
+        mConnectedEthernetNetworkController.displayPreference(getPreferenceScreen());
+    }
+
     @Override
     public void onActivityCreated(Bundle savedInstanceState) {
         super.onActivityCreated(savedInstanceState);