<AWT Dev> RFR: 8256110: Create implementation for NSAccessibilityStepper protocol

[Alexander Zuev]

8256110: Create implementation for NSAccessibilityStepper protocol

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Commit messages:
 - Fixed small glitch in new code.
 - 8256110: Create implementation for NSAccessibilityStepper protocol
 - Merge remote-tracking branch 'upstream/master' into master
 - Merge branch 'openjdk-master' into master
 - Merge branch 'master' of https://github.com/openjdk/jdk into openjdk-master
 - Merge pull request #7 from openjdk/master
 - Merge pull request #6 from openjdk/master
 - Merge pull request #5 from openjdk/master
 - Merge pull request #4 from openjdk/master
 - Merge pull request #3 from openjdk/master
 - ... and 2 more: https://git.openjdk.java.net/jdk/compare/bf28f925...43b4ef01

Changes: https://git.openjdk.java.net/jdk/pull/2092/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2092&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8256110
  Stats: 127 lines in 5 files changed: 114 ins; 11 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2092.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2092/head:pull/2092

PR: https://git.openjdk.java.net/jdk/pull/2092