[8u] Review request: RT-36360 [Monocle] Slight refactor; cache native display in java instead of native code

[Lisa Selle]

Hi Daniel,

Please review the following minor refactoring to the IMX monocle 
implementation:

https://javafx-jira.kenai.com/browse/RT-36360
http://cr.openjdk.java.net/~kselle/webrev-20140324-1306-RT-36360/webrev/

Thanks,

Lisa