[jdk11u-dev] RFR: 8262981: Create implementation for NSAccessibilitySlider protocol

[Christoph Langer]

I propose to backport JDK-8262981 in a way that does not require a CSR. Just integrate the native code but don't touch the Java interface of javax.swing.JSlider.

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Commit messages:
 - Backport 9d669c912d3977027f321a5e6b7f045ca2ce9482

Changes: https://git.openjdk.org/jdk11u-dev/pull/1811/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1811&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8262981
  Stats: 8 lines in 3 files changed: 0 ins; 2 del; 6 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1811.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1811/head:pull/1811

PR: https://git.openjdk.org/jdk11u-dev/pull/1811