Progressive disclosure on selected UIs: app, display

Bug: 32255863
Test: RunSettingsRoboTests
Change-Id: I1651433ba30a2b5f880095e07b5e2ed9c4e308b9

src/com/android/settings/dashboard/ExpandPreference.java

@@ -47,6 +47,7 @@ public class ExpandPreference extends Preference {
 
     private void init() {
         setLayoutResource(R.layout.expand_preference);
+        setIcon(R.drawable.ic_arrow_down_24dp);
         setTitle(R.string.wifi_more);
         setOrder(999);
     }