[jdk11u-dev] RFR: 8261350: Create implementation for NSAccessibilityCheckBox protocol peer

[Autumn Capasso]

[JDK-8261350](https://bugs.openjdk.org/browse/JDK-8261350) Clean Backport. One of a series of 28 https://bugs.openjdk.org/browse/JDK-8152350

-------------

Commit messages:
 - Backport 2b00367e1154feb2c05b84a11d62fb5750e46acf

Changes: https://git.openjdk.org/jdk11u-dev/pull/1646/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1646&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8261350
  Stats: 11 lines in 5 files changed: 1 ins; 4 del; 6 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1646.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1646/head:pull/1646

PR: https://git.openjdk.org/jdk11u-dev/pull/1646