[macosx] javax/swing/JScrollBar/7163696/Test7163696.java failed intermittently on macos

new test javax/swing/JScrollBar/7163696/Test7163696.java failed intermittently (almost always) on macos

reproduced with jdk: 7u40b60, 7u40b43, 7u25b15
can't reproduce the issue on linux oel 64 bit with 7u40b60

log:
----------System.out:(2/24)----------
name = Metal
value = 50
----------System.err:(15/910)----------
2013-09-05 18:32:18.961 java[9858:507] ApplePersistenceIgnoreState: Existing state will not be touched. New state will be written to /var/folders/1n/2sd5m7tj7cx_wpvl_jc55lhr001wjw/T/net.java.openjdk.cmd.savedState
java.lang.Error: TEST FAILED
at Test7163696.test(Test7163696.java:78)
at Test7163696.main(Test7163696.java:50)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at com.sun.javatest.regtest.MainWrapper$MainThread.run(MainWrapper.java:94)
at java.lang.Thread.run(Thread.java:724)

perhaps the problem in toolkit.realSync; it doesn' work on macos - see JDK-8003533