RFR: 8281296: Create a regression test for JDK-4515999 [v2]

[Manukumar V S]

> Create a regression test for [JDK-4515999](https://bugs.openjdk.java.net/browse/JDK-4515999)
> Create a test which checks whether incrementing dates via the keyboard (up/down) gives the same results as when using mouse press on the arrow buttons in a JSpinner.

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

  Fixed review comments: JSpinner access in EDT,formatting changes,BUTTON1_DOWN_MASK,Copyright header

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/7363/files
  - new: https://git.openjdk.java.net/jdk/pull/7363/files/c997a74f..e1213acc

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=7363&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=7363&range=00-01

  Stats: 69 lines in 1 file changed: 41 ins; 6 del; 22 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7363.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7363/head:pull/7363

PR: https://git.openjdk.java.net/jdk/pull/7363