packages/SystemUI/res/layout/tile_listing.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
 ** Copyright 2015, The Android Open Source Project
 **
 ** Licensed under the Apache License, Version 2.0 (the "License"); 
 ** you may not use this file except in compliance with the License. 
 ** You may obtain a copy of the License at 
 **
 **     http://www.apache.org/licenses/LICENSE-2.0 
 **
 ** Unless required by applicable law or agreed to in writing, software 
 ** distributed under the License is distributed on an "AS IS" BASIS, 
 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
 ** See the License for the specific language governing permissions and 
 ** limitations under the License.
 -->

 <LinearLayout
     xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
     android:background="@drawable/qs_background_primary"
     android:paddingBottom="20dp"
     android:orientation="vertical">

     <LinearLayout
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:background="@drawable/notification_header_bg"
         android:paddingStart="?android:attr/listPreferredItemPaddingStart"
         android:paddingEnd="?android:attr/listPreferredItemPaddingEnd"
         android:paddingTop="10dp"
         android:paddingBottom="10dp"
         android:orientation="horizontal">
         <ImageView
             android:id="@android:id/icon"
             android:layout_width="36dp"
             android:layout_height="36dp" />
         <TextView
             android:id="@android:id/title"
             android:paddingStart="10dp"
             android:textColor="@android:color/white"
             android:textAppearance="?android:attr/textAppearanceSmall"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:layout_gravity="center_vertical" />
     </LinearLayout>

     <GridLayout
         android:id="@+id/tile_grid"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:columnCount="4" />

 </LinearLayout>