Indicate selected menu item state in drawer (1/2)

Bug 28754805

Change-Id: Ie3aa9bab80266515b49ab33d75be4b188b7eb954
diff --git a/res/layout/contacts_drawer_activity.xml b/res/layout/contacts_drawer_activity.xml
index 008d4f5..ad68e84 100644
--- a/res/layout/contacts_drawer_activity.xml
+++ b/res/layout/contacts_drawer_activity.xml
@@ -57,6 +57,7 @@
         android:layout_height="match_parent"
         android:layout_gravity="start"
         android:fitsSystemWindows="true"
+        app:itemBackground="@drawable/drawer_item_background"
         app:headerLayout="@layout/nav_header_main"
         app:menu="@menu/activity_main_drawer"/>