[9] Review request for 8051548 JColorChooser should have a way to disable transparency controls

[Alexander Scherbatiy]

Hello,
Could you review the fix:
  bug: https://bugs.openjdk.java.net/browse/JDK-8051548
  webrev: http://cr.openjdk.java.net/~alexsch/8051548/webrev.00

  The following public methods are added to the AbstractColorChooserPanel:
  - setColorTransparencySelectionEnabled(boolean b)
  - isColorTransparencySelectionEnabled()

 The request to the public API change will be created after the 
technical review.

Thanks,
Alexandr.