[9] Review Request: 8061315 [JFXPanel, Mac] need an ability to check if Clipboard has been changed from outside of Swing/AWT

[Anton V. Tarasov]

Hello,

Please review a fix:
https://bugs.openjdk.java.net/browse/JDK-8061315
http://cr.openjdk.java.net/~ant/JDK-8061315/webrev.0

The problem is originally reproducible with JFXPanel added to a Swing app. A text copied from an Fx 
text field can't be pasted to a Swing control. This is MacOS X only.

I've added a new method - SunClipboard.checkLostOwnership() - which provides access to internal 
peer's functionality.

Thanks,
Anton.