<AWT Dev> RFR: 8263928: Add JAWT test files for mac

[Prasanta Sadhukhan]

JAWT has testcase for windows and linux but no testcase is provided for mac.
We need to have a JAWT based testcase for mac, in similar lines to windows and linux.

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Commit messages:
 - fix
 - Add JAWT mac files

Changes: https://git.openjdk.java.net/jdk/pull/3112/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3112&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8263928
  Stats: 228 lines in 3 files changed: 228 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3112.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3112/head:pull/3112

PR: https://git.openjdk.java.net/jdk/pull/3112