[OpenJDK 2D-Dev] RFR: JDK8u20 backport of 8035569: JNI correctness fixes in WPrinterJob.cpp

[Phil Race]

Jennifer & Sergey,

Please check the identical JDK8u20 backport of the fix for the
JNI corrrectness fix in WPrinterJob.cpp that you previously approved for 
JDK 9
Bug link: https://bugs.openjdk.java.net/browse/JDK- 8035569
Synopsis: [parfait] JNI expection pending in 
jdk/src/windows/native/sun/windows/WPrinterJob.cpp
JDK9 changeset: http://hg.openjdk.java.net/jdk9/client/jdk/rev/06fd809d777f
JDK8u20 backport : http://cr.openjdk.java.net/~prr/8035569.8u20/
-phil.