[jfx25u] RFR: 8335748: Rippling of frame on scrolling

[Ambarish Rapte]

This is a metal specific change, that implements vsync support for fixing frame tearing.

-------------

Commit messages:
 - Backport 43d392040595cded591126e801c4747f72330905

Changes: https://git.openjdk.org/jfx25u/pull/37/files
  Webrev: https://webrevs.openjdk.org/?repo=jfx25u&pr=37&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8335748
  Stats: 147 lines in 11 files changed: 76 ins; 25 del; 46 mod
  Patch: https://git.openjdk.org/jfx25u/pull/37.diff
  Fetch: git fetch https://git.openjdk.org/jfx25u.git pull/37/head:pull/37

PR: https://git.openjdk.org/jfx25u/pull/37