RFR: 8315701: [macos] Regression: KeyEvent has different keycode on different keyboard layouts

[Alisen Chung]

Updated previous fix (8262945) to work on extendedKeyCodes. Updated AcceleratorTest to use PassFailJFrame instead of Applet

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Commit messages:
 - added tags to test
 - Merge branch 'master' of https://github.com/openjdk/jdk into 8315701
 - init commit

Changes: https://git.openjdk.org/jdk/pull/16664/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=16664&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8315701
  Stats: 434 lines in 7 files changed: 91 ins; 264 del; 79 mod
  Patch: https://git.openjdk.org/jdk/pull/16664.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16664/head:pull/16664

PR: https://git.openjdk.org/jdk/pull/16664