[adbwifi] Add qstile for wireless debugging.

Bug: 153275926

Test: make RunSettingsRoboTests ROBOTEST_FILTER=WirelessDebuggingTest
Change-Id: I6b381a7e29beec5c9c345b374e127caabdb674db

src/com/android/settings/development/WirelessDebuggingPreferenceController.java

@@ -135,7 +135,10 @@ public class WirelessDebuggingPreferenceController extends DeveloperOptionsPrefe
         ((MasterSwitchPreference) preference).setChecked(enabled);
     }
 
-    static boolean isWifiConnected(Context context) {
+    /**
+     * Returns true if connected to Wi-Fi network.
+     */
+    public static boolean isWifiConnected(Context context) {
         ConnectivityManager cm = (ConnectivityManager) context.getSystemService(
                 Context.CONNECTIVITY_SERVICE);
         if (cm != null) {