SystemUIGoogle/res/layout/glow_view.xml

<?xml version="1.0" encoding="utf-8"?>
<com.google.android.systemui.assist.uihints.GlowView
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="250.0dip"
    android:clipChildren="false"
    android:contentDescription="@string/assistant_scrim_label"
    android:layout_gravity="bottom"
    android:orientation="horizontal"
    android:visibility="gone">

    <ImageView
        android:id="@id/blue_glow"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:cropToPadding="true"
        android:scaleType="matrix"
        android:tint="@color/edge_light_blue" />

    <ImageView
        android:id="@id/yellow_glow"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:cropToPadding="true"
        android:scaleType="matrix"
        android:tint="@color/edge_light_yellow" />

    <ImageView
        android:id="@id/red_glow"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:cropToPadding="true"
        android:scaleType="matrix"
        android:tint="@color/edge_light_red" />

    <ImageView
        android:id="@id/green_glow"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:cropToPadding="true"
        android:scaleType="matrix"
        android:tint="@color/edge_light_green" />

</com.google.android.systemui.assist.uihints.GlowView>