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/wrapper/WifiManagerWrapper.java

@@ -1,5 +1,6 @@
 package com.android.settings.wrapper;
 
+import android.net.wifi.WifiConfiguration;
 import android.net.wifi.WifiManager;
 
 /**
@@ -37,9 +38,16 @@ public class WifiManagerWrapper {
     }
 
     /**
-     * {@link WifiManager#removePasspointConfiguration}
+     * {@link WifiManager#forget}
      */
     public void forget(int netId, WifiManager.ActionListener listener) {
         mWifiManager.forget(netId, listener);
     }
+
+    /**
+     * {@link WifiManager#save}
+     */
+    public void save(WifiConfiguration config, WifiManager.ActionListener listener) {
+        mWifiManager.save(config, listener);
+    }
 }