packages/SystemUI/res/drawable/dismiss_all_shape.xml

<vector xmlns:android="http://schemas.android.com/apk/res/android"
    android:height="17dp"
    android:width="85dp"
    android:viewportHeight="48"
    android:viewportWidth="260" >
    <group
        android:name="dismiss_all"
        android:translateX="48"
        android:translateY="6" >
        <group
            android:name="3"
            android:translateX="-24"
            android:translateY="36" >
            <path
                android:name="rectangle_path_1_2"
                android:pathData="M -24.0,-6.0 l 48.0,0 l 0,12.0 l -48.0,0 Z"
                android:fillColor="#FFFFFFFF"
                android:fillAlpha="1" />
        </group>
        <group
            android:name="2"
            android:translateX="-12"
            android:translateY="18" >
            <path
                android:name="rectangle_path_1_1"
                android:pathData="M -24.0,-6.0 l 48.0,0 l 0,12.0 l -48.0,0 Z"
                android:fillColor="#FFFFFFFF"
                android:fillAlpha="1" />
        </group>
        <group
            android:name="1" >
            <path
                android:name="rectangle_path_1"
                android:pathData="M -24.0,-6.0 l 48.0,0 l 0,12.0 l -48.0,0 Z"
                android:fillColor="#FFFFFFFF"
                android:fillAlpha="1" />
        </group>
    </group>
</vector>