Add support for setting lock widgets

Change-Id: I26165f1bc60e3cf277dbdd4f627ac720b492ffde
diff --git a/res/xml/security_settings_pattern.xml b/res/xml/security_settings_pattern.xml
index b91b2b6..ebc9c41 100644
--- a/res/xml/security_settings_pattern.xml
+++ b/res/xml/security_settings_pattern.xml
@@ -25,6 +25,11 @@
             android:title="@string/unlock_set_unlock_launch_picker_title"
             android:summary="@string/unlock_set_unlock_mode_pattern"
             android:persistent="false"/>
+        <PreferenceScreen
+           android:key="choose_user_selected_lockscreen_widget"
+           android:title="@string/choose_user_selected_lockscreen_widget_picker_title"
+           android:summary=""
+           android:persistent="false"/>
 
         <CheckBoxPreference
             android:key="visiblepattern"