Add scroll indicators to QS editing

Bug: 27220234
Bug: 27251104
Change-Id: I678af59401a98fb272c1d29b9c5e3c925d9ec7a5
diff --git a/packages/SystemUI/res/layout/qs_customize_panel.xml b/packages/SystemUI/res/layout/qs_customize_panel.xml
index 458ce2d..582ad48 100644
--- a/packages/SystemUI/res/layout/qs_customize_panel.xml
+++ b/packages/SystemUI/res/layout/qs_customize_panel.xml
@@ -34,7 +34,9 @@
         android:id="@android:id/list"
         android:layout_width="@dimen/notification_panel_width"
         android:layout_height="0dp"
-        android:layout_weight="1" />
+        android:layout_weight="1"
+        android:scrollIndicators="top"
+        android:scrollbars="vertical" />
 
     <View
         android:layout_width="match_parent"