[jdk11u-dev] RFR: 8256110: Create implementation for NSAccessibilityStepper protocol [v2]

[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:

  8256110: Create implementation for NSAccessibilityStepper protocol
  
  Reviewed-by: pbansal, serb
  
  (cherry picked from commit 5dc5d9401e7a176da53a14293fb59e97b644b31a)
  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/2b6089d8..b9e50998

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1591&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1591&range=00-01

  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