[9] Code Review Request For 8157500: Create unit tests for new public methods in GridPane

[Chien Yang]

Hi Kevin,

Please review the proposed unit test:

JIRA: https://bugs.openjdk.java.net/browse/JDK-8157500
Webev: http://cr.openjdk.java.net/~ckyang/JDK-8157500/webrev.00/

Thanks,
- Chien