packages/SystemUI/res/layout/status_bar_notification_row.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="65dp"
    >

    <ImageButton
        android:id="@+id/veto"
        android:layout_width="48dp"
        android:layout_height="match_parent"
        android:layout_centerVertical="true"
        android:layout_alignParentRight="true"
        android:src="@drawable/status_bar_veto"
        android:scaleType="center"
        android:background="@null"
        android:paddingRight="8dp"
        android:paddingLeft="8dp"
        />

    <ImageView
        android:id="@+id/large_icon"
        android:layout_width="@android:dimen/notification_large_icon_width"
        android:layout_height="@android:dimen/notification_large_icon_height"
        android:layout_alignParentTop="true"
        android:layout_alignParentLeft="true"
        android:scaleType="center"
        />

    <com.android.systemui.statusbar.LatestItemView android:id="@+id/content"
        android:layout_width="match_parent"
        android:layout_height="64dp"
        android:layout_alignParentTop="true"
        android:layout_toRightOf="@id/large_icon"
        android:layout_toLeftOf="@id/veto"
        android:focusable="true"
        android:clickable="true"
        />

    <View
        android:layout_width="match_parent"
        android:layout_height="1dp"
        android:layout_alignParentBottom="true"
        android:background="@android:drawable/divider_horizontal_dark"
        />

</RelativeLayout>