[jdk11u-dev] RFR: 8256110: Create implementation for NSAccessibilityStepper protocol [v3]

[Autumn Capasso]

> Backport [JDK-8256110](https://bugs.openjdk.org/browse/JDK-8256110) 
> Clean. One of a series of 28 https://bugs.openjdk.org/browse/JDK-8152350
> --author "Autumn Capasso <autumncap at amazon.com>"

Autumn Capasso has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR. The pull request contains one new commit since the last revision:

  Backport acbcde8c3c004efe3d95166f471ee77ac8415af7
  By: Autumn808 <AutumnCapasso at gmail.com>
  
  Signed-off-by: Autumn808 <AutumnCapasso at gmail.com>

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Changes:
  - all: https://git.openjdk.org/jdk11u-dev/pull/1591/files
  - new: https://git.openjdk.org/jdk11u-dev/pull/1591/files/b9e50998..98db7df2

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1591&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1591&range=01-02

  Stats: 0 lines in 0 files changed: 0 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1591.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1591/head:pull/1591

PR: https://git.openjdk.org/jdk11u-dev/pull/1591