Create implementation for Slider and Stepper accessibility protocols. Fix mapping. Fix performAction parameter type in declaration.
------------- Commit messages: - 8313556: Create implementation of NSAccessibilitySlider protocol Changes: https://git.openjdk.org/jfx/pull/1226/files Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1226&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8313556 Stats: 199 lines in 6 files changed: 197 ins; 0 del; 2 mod Patch: https://git.openjdk.org/jfx/pull/1226.diff Fetch: git fetch https://git.openjdk.org/jfx.git pull/1226/head:pull/1226 PR: https://git.openjdk.org/jfx/pull/1226
