RFR: 8282860: Write a regression test for JDK-4164779 [v2]

[Manukumar V S]

> Write a regression test for [JDK-4164779](https://bugs.openjdk.java.net/browse/JDK-4164779) : JSplitPane keyboard navigation does not support F6 and Ctrl+Tab
> Context: Migrating tests from a closed tonga based test suite to open regression based one.
> 
> Issue:
> The specified keyboard support for JSplitPane also requires F6 and Ctrl+Tab (navigate out) for the JSplitPane. Those are currently not implemented.
> 
> F6 is supposed to move the focus from the current focused component on one side of the JSplitPane to the other side of the JSplitPane without having to tab through to that.
> 
> Ctrl+Tab is supposed to move the input focus from whatever component inside the JSplitPane that has the focus to the next component outside the JSplitPane.
> 
> 
> Testing:
> Java 1.4.0 -> Test Failed.
> $ ./j2sdk1.4.0/bin/java JSplitPaneTest
> Verifier 1 failed
> Verifier 2 failed
> Verifier 3 failed
> Verifier 4 failed
> Test Failed.
> 
> Java 1.4.1 -> Test Passed.
> $ ./j2sdk1.4.1/bin/java JSplitPaneTest
> Verifier 1 passed
> Verifier 2 passed
> Verifier 3 passed
> Verifier 4 passed
> Test Passed.

Manukumar V S has updated the pull request incrementally with one additional commit since the last revision:

  Added Copyright header

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/7801/files
  - new: https://git.openjdk.java.net/jdk/pull/7801/files/4eb3365c..14b67eb6

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=7801&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=7801&range=00-01

  Stats: 24 lines in 1 file changed: 23 ins; 1 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7801.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7801/head:pull/7801

PR: https://git.openjdk.java.net/jdk/pull/7801