hg: jdk9/client/jdk: 8172500: Create test for SwingSet SliderDemo

[alexander.kouznetsov at oracle.com]

Changeset: 7bea1b574070
Author:    mrkam
Date:      2017-02-15 16:16 -0800
URL:       http://hg.openjdk.java.net/jdk9/client/jdk/rev/7bea1b574070

8172500: Create test for SwingSet SliderDemo
Reviewed-by: serb, mrkam
Contributed-by: Vikrant Agarwal <vikrant.v.agarwal at oracle.com>

+ test/sanity/client/SwingSet/src/SliderDemoTest.java
+ test/sanity/client/lib/SwingSet3/src/com/sun/swingset3/demos/slider/SliderDemo.java
+ test/sanity/client/lib/SwingSet3/src/com/sun/swingset3/demos/slider/resources/SliderDemo.properties