<AWT Dev> RFR: JDK-8076106: [macosx] Drag image of TransferHandler does not honor MultiResolutionImage

[Hendrik Schreiber]

Please review the following JDK9 patch, which adds the ability to display MultiResolutionImages as drag images on OS X.

bug: https://bugs.openjdk.java.net/browse/JDK-8076106
webrev: http://cr.openjdk.java.net/~alexsch/hendrik-schreiber/8076106

I signed a Oracle Contributor Agreement a while ago.

Thank you.

-hendrik