RFR: 8281738: Create a regression test for checking the 'Space' key activation of focused Button

[Manukumar V S]

This test verifies in all platforms and in all 'Look and Feels' that pressing the 'Space' key generates ActionEvent on focused Button or not.

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Commit messages:
 - 8281738: Create a regression test for checking the 'Space' key activation of focused Button

Changes: https://git.openjdk.java.net/jdk/pull/7460/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7460&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8281738
  Stats: 116 lines in 1 file changed: 116 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7460.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7460/head:pull/7460

PR: https://git.openjdk.java.net/jdk/pull/7460