[jdk11u-dev] RFR: 8256126: Create implementation for NSAccessibilityImage protocol peer

[Autumn Capasso]

Clean Backport [JDK-8256126](https://bugs.openjdk.org/browse/JDK-8256126). One of a series of 28 https://bugs.openjdk.org/browse/JDK-8152350

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

Commit messages:
 - Backport bbb93ca3c80968d4f167bb4cd9e5d3e60e4a6a5b

Changes: https://git.openjdk.org/jdk11u-dev/pull/1589/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1589&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8256126
  Stats: 42 lines in 3 files changed: 39 ins; 1 del; 2 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1589.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1589/head:pull/1589

PR: https://git.openjdk.org/jdk11u-dev/pull/1589