[Rev 01] RFR: 8240694: [macos 10.15] JavaFX Media hangs on some video files on Catalina

[Alexander Matveev]

> https://bugs.openjdk.java.net/browse/JDK-8240694
> 
> - Original fix JDK-8236832 was reverted.
> - Timestamp will be queried on event loop thread when spectrum event is received by event loop.
> - FIx only enabled for macOS when using OSXPlatform.

Alexander Matveev has updated the pull request incrementally with one additional commit since the last revision:

  8240694: Improved comments per reviewers request

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

Changes:
  - all: https://git.openjdk.java.net/jfx/pull/163/files
  - new: https://git.openjdk.java.net/jfx/pull/163/files/b43ace5c..0ea46c79

Webrevs:
 - full: https://webrevs.openjdk.java.net/jfx/163/webrev.01
 - incr: https://webrevs.openjdk.java.net/jfx/163/webrev.00-01

  Stats: 7 lines in 3 files changed: 5 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jfx/pull/163.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/163/head:pull/163

PR: https://git.openjdk.java.net/jfx/pull/163