RFR: 8299412 JNI call of getAccessibleActionCount on a wrong thread [v2]

[Artem Semenov]

> [CommonComponentAccessibility getActionsWithEnv:] defines the getAccessibleActionCount method on the AccessibleAction class, however the call should go through CAccessibility so that it is executed on the Event Dispatch thread.
> 
> @azuev-java @mrserb @prrace please review

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

  There's a more compact way of doing this:

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Changes:
  - all: https://git.openjdk.org/jdk/pull/11803/files
  - new: https://git.openjdk.org/jdk/pull/11803/files/a28dcb75..32c70b7e

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=11803&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=11803&range=00-01

  Stats: 5 lines in 1 file changed: 0 ins; 4 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/11803.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11803/head:pull/11803

PR: https://git.openjdk.org/jdk/pull/11803