<AWT Dev> RFR: 8270116: Expand ButtonGroupLayoutTraversalTest.java to run in all LaFs, including Aqua on macOS [v2]

[rajat mahajan]

> Summary: Expanded ButtonGroupLayoutTraversalTest.java to run in all LAFs on all OS. Added synchronization for focusCnt.

rajat mahajan has updated the pull request incrementally with one additional commit since the last revision:

  make variables with static final modifier CAPS, as per coding standard.

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/4937/files
  - new: https://git.openjdk.java.net/jdk/pull/4937/files/7f683d1e..b05f3d4a

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=4937&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=4937&range=00-01

  Stats: 10 lines in 1 file changed: 0 ins; 0 del; 10 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4937.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4937/head:pull/4937

PR: https://git.openjdk.java.net/jdk/pull/4937