Fixes [JDK-8248381](https://bugs.openjdk.java.net/browse/JDK-8248381).
------------- Commit messages: - 8248381: Create a daemon thread for MonocleTimer Changes: https://git.openjdk.java.net/jfx/pull/256/files Webrev: https://webrevs.openjdk.java.net/jfx/256/webrev.00 Issue: https://bugs.openjdk.java.net/browse/JDK-8248381 Stats: 8 lines in 1 file changed: 7 ins; 0 del; 1 mod Patch: https://git.openjdk.java.net/jfx/pull/256.diff Fetch: git fetch https://git.openjdk.java.net/jfx pull/256/head:pull/256 PR: https://git.openjdk.java.net/jfx/pull/256
