RFR: 8283624: Create an automated regression test for RFE-4390885

[Manukumar V S]

Write a regression test for [JDK-4390885](https://bugs.openjdk.java.net/browse/JDK-4390885) Enhancement Request.

Issue:
Please add the ability to set the location of a JFileChooser. This might be a
bug, but JFileChooser.setLocation() has no effect when
JFileChooser.showXXXXDialog() is called. This is becoming very important as the
popularity of multiple monitors is increasing. These dialogs show up on the
wrong monitor which is really annoying. Also due to bug #4189244 I am unable to
avoid painting problems by positioning the dialog away from the menu item that
initiated it.

Fix:
Now it's possible to set the location of Dialog in JFileChooser.

Testing:
1. Tested in Mach5 10 times per platform(macos,linux,windows) and got all Pass.

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Commit messages:
 - 8283624: Create an automated regression test for RFE-4390885

Changes: https://git.openjdk.java.net/jdk/pull/7996/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7996&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8283624
  Stats: 279 lines in 1 file changed: 279 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7996.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7996/head:pull/7996

PR: https://git.openjdk.java.net/jdk/pull/7996