Fix "Add Network" button on SavedAccessPoints page.

Fix merge conflict.

The old onSubmit was a no-op. It now correctly pipes onSubmit to
WifiManager#save() with the new WifiConfiguration. On successful save,
it displays the new network in the list, and on failure, it displays a
toast indicating that the save action failed. Adds a test for the
WifiDialog behaviors on this page.

Bug: 66177765
Test: make RunSettingsRoboTests, manual - tested with Wifi enabled and
disabled, and with networks that were visible and not.
Change-Id: I27446aa49bc9efaf1ea1d6c6158928b62ce01ba2

src/com/android/settings/wifi/SavedAccessPointsWifiSettings.java

@@ -17,6 +17,7 @@
 package com.android.settings.wifi;
 
 import android.annotation.Nullable;
+import android.app.Activity;
 import android.app.Dialog;
 import android.content.Context;
 import android.icu.text.Collator;
@@ -28,6 +29,7 @@ import android.support.v7.preference.Preference;
 import android.support.v7.preference.PreferenceScreen;
 import android.util.Log;
 
+import android.widget.Toast;
 import com.android.internal.logging.nano.MetricsProto;
 import com.android.internal.logging.nano.MetricsProto.MetricsEvent;
 import com.android.settings.R;
@@ -88,6 +90,22 @@ public class SavedAccessPointsWifiSettings extends SettingsPreferenceFragment
         }
     };
 
+    private final WifiManager.ActionListener mSaveListener = new WifiManager.ActionListener() {
+        @Override
+        public void onSuccess() {
+            postUpdatePreference();
+        }
+        @Override
+        public void onFailure(int reason) {
+            Activity activity = getActivity();
+            if (activity != null) {
+                Toast.makeText(activity,
+                    R.string.wifi_failed_save_message,
+                    Toast.LENGTH_SHORT).show();
+            }
+        }
+    };
+
     private WifiDialog mDialog;
     private WifiManagerWrapper mWifiManager;
     private AccessPoint mDlgAccessPoint;
@@ -267,7 +285,7 @@ public class SavedAccessPointsWifiSettings extends SettingsPreferenceFragment
 
     @Override
     public void onSubmit(WifiDialog dialog) {
-        // Ignored
+        mWifiManager.save(dialog.getController().getConfig(), mSaveListener);
     }
 
     @Override