hg: jdk9/client/jdk: 8139183: drawImage misses background's alpha channel

[prasanta.sadhukhan at oracle.com]

Changeset: d1c481a18d0c
Author:    jdv
Date:      2016-03-10 14:14 +0530
URL:       http://hg.openjdk.java.net/jdk9/client/jdk/rev/d1c481a18d0c

8139183: drawImage misses background's alpha channel
Reviewed-by: flar, psadhukhan

! src/java.desktop/share/classes/sun/java2d/pipe/DrawImage.java
+ test/java/awt/image/DrawImage/ScaledImageAlphaTest.java