Add test pattern icon to Fountain.

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.android.fountain">

    <application android:label="Fountain">

    <application 

        android:label="Fountain"

        android:icon="@drawable/test_pattern">

        <activity android:name="Fountain">

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />