RFR: 8274383 JNI call of getAccessibleSelection on a wrong thread [v2]

[Artem Semenov]

> [ComboBoxAccessibility accessibilityValue] defines the getAccessibleSelection method on the AccessibleContext class, however the call should go through CAccessibility so that it is executed on the Event Dispatch thread.

Artem Semenov has updated the pull request incrementally with one additional commit since the last revision:

  JDK-8274383: JNI call of getAccessibleSelection on a wrong thread

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/5735/files
  - new: https://git.openjdk.java.net/jdk/pull/5735/files/8adcb24f..bb514053

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=5735&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=5735&range=00-01

  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5735.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5735/head:pull/5735

PR: https://git.openjdk.java.net/jdk/pull/5735