RFR: 8298644 JNI call of getCurrentComponent on a wrong thread

[Artem Semenov]

[OutlineRowAccessibility currentAccessibleWithENV:] defines the getCurrentComponent method on the AccessibleContext instance of AccessibleJTreeNode class, however the call should go through CAccessibility so that it is executed on the Event Dispatch thread.

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Commit messages:
 - 8298644 JNI call of getCurrentComponent on a wrong thread

Changes: https://git.openjdk.org/jdk/pull/11670/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11670&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8298644
  Stats: 99 lines in 6 files changed: 80 ins; 14 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/11670.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11670/head:pull/11670

PR: https://git.openjdk.org/jdk/pull/11670