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

[Autumn Capasso]

> Backport [JDK-8256110](https://bugs.openjdk.org/browse/JDK-8256110) clean backport. One of 28 https://bugs.openjdk.org/browse/JDK-8152350

Autumn Capasso has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase.

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Changes:
  - all: https://git.openjdk.org/jdk11u-dev/pull/1578/files
  - new: https://git.openjdk.org/jdk11u-dev/pull/1578/files/d7face5c..d7face5c

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1578&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1578&range=00-01

  Stats: 0 lines in 0 files changed: 0 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1578.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1578/head:pull/1578

PR: https://git.openjdk.org/jdk11u-dev/pull/1578