[9] Review request for 8162856 JSlider thumb is twice smaller on HiDPI display

[Alexandr Scherbatiy]

Hello,
Could you review the fix:
  bug: https://bugs.openjdk.java.net/browse/JDK-8162856
  webrev: http://cr.openjdk.java.net/~alexsch/8162856/webrev.00

  This is a regression from the fix: JDK-8143064 Icons are not properly 
rendered with Windows L&F on HiDPI display
MetalIconFactory.OceanVerticalSliderThumbIcon/OceanHorizontalSliderThumbIcon.paintToImage(...) 
methods do not take the provided image size into account.
  The fix sets graphics scale when icon sizes are different from default.

 Thanks,
 Alexandr.