RFR: 8281338 NSAccessibilityPressAction action for tree node and NSAccessibilityShowMenuAcgtion action not working

[Artem Semenov]

The "toggle popup" accessibility action does not correctly match the NSAccessibleShowMenuAction action. 
The "toggleExpand" accessibility action does not correctly match the NSAccessibilityPressAction action.

@forantar @azuev-java please review.

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Commit messages:
 - 8281338 NSAccessibilityPressAction action for tree node and NSAccessibilityShowMenuAcgtion action not working

Changes: https://git.openjdk.java.net/jdk/pull/7381/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7381&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8281338
  Stats: 184 lines in 2 files changed: 182 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7381.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7381/head:pull/7381

PR: https://git.openjdk.java.net/jdk/pull/7381