[8] Review request for 8024926 [macosx] AquaIcon HiDPI support

[Alexander Scherbatiy]

Hello,

Could you review the fix:
   bug: https://bugs.openjdk.java.net/browse/JDK-8024926
   webrev: http://cr.openjdk.java.net/~alexsch/8024926/webrev.00

The fix returns a high resolution system icon in the overridden 
getScaledInstance(width, height, hints) method.

The fix relies on the fix for the issue JDK-8011059 [macosx] Make JDK 
demos look perfect on retina displays:
http://mail.openjdk.java.net/pipermail/awt-dev/2013-October/006133.html
  - getScaledInstance(width, height, hints) method is used for the image 
drawing when IMAGE_SCALING hints are enabled
  - LWCToolkit.ScalableToolkitImage class is public

Thanks,
Alexandr.