[jdk11u-dev] RFR: 8264304: Create implementation for NSAccessibilityToolbar protocol peer

[Autumn Capasso]

This backport is part of the 28 backport Accessibility series JDK-8152350.

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Commit messages:
 - Merge branch 'master' into JDK-8264304
 - Backport 4d26f22b9adcf7cecca5316348ef670ac2dbc365
 - Backport f07dcf471c160e09fbc748124998923e7d453e66

Changes: https://git.openjdk.org/jdk11u-dev/pull/1800/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1800&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8264304
  Stats: 104 lines in 5 files changed: 98 ins; 0 del; 6 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1800.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1800/head:pull/1800

PR: https://git.openjdk.org/jdk11u-dev/pull/1800