[9] Review request for 8043869 [macosx] java -splash does not honor @2x hi dpi notation for retina support

[Alexander Scherbatiy]

Hello,
Could you review the fix:
  bug: https://bugs.openjdk.java.net/browse/JDK-8043869
  webrev: http://cr.openjdk.java.net/~alexsch/8043869/webrev.00

  The scaleFactor field is added to the Splash struct.
  The SplahsScreen class scales the graphics and the size according to 
the scale factor.
  The native system tries to load high resolution splash image on HiDPI 
display.

Thanks,
Alexandr.