Consolidate all wrappers used for testing.

- Add the wrapper package and move all wrappers to the wrapper package.
- Get rid of some wrapper interface/impl implementation and have a
wrapper class directly.

Bug: 65634579
Test: make RunSettingsRoboTests
Change-Id: Ic757d8f7bacfa7a034c7e692205bc1dc4b0e1de1

src/com/android/settings/wrapper/WifiManagerWrapper.java

@@ -0,0 +1,23 @@
+package com.android.settings.wrapper;
+
+import android.net.wifi.WifiManager;
+
+/**
+ * Wrapper around {@link WifiManager} to facilitate unit testing.
+ *
+ * TODO: delete this class once robolectric supports Android O
+ */
+public class WifiManagerWrapper {
+    private final WifiManager mWifiManager;
+
+    public WifiManagerWrapper(WifiManager wifiManager) {
+        mWifiManager = wifiManager;
+    }
+
+    /**
+     * {@link WifiManager#getCurrentNetworkWpsNfcConfigurationToken}
+     */
+    public String getCurrentNetworkWpsNfcConfigurationToken() {
+        return mWifiManager.getCurrentNetworkWpsNfcConfigurationToken();
+    }
+}