RFR: 8341972: java/awt/dnd/DnDRemoveFocusOwnerCrashTest.java timed out after JDK-8341257

[Damon Nguyen]

Intermittent failure of awt test in windows only. When re-testing locally, the drag button wasn't actually drawn in the test. I made p static, added stability delays, and moved robot out of the EDT (as well as caught a duplicate robot instantiation). There's a merging issue that also missed adding this test to the problem list for MacOS, so it's been added here.

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Commit messages:
 - Add volatile
 - Initial commit

Changes: https://git.openjdk.org/jdk/pull/21477/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21477&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8341972
  Stats: 39 lines in 2 files changed: 15 ins; 23 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/21477.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21477/head:pull/21477

PR: https://git.openjdk.org/jdk/pull/21477