Created a test that validates various Nodes can be initialized in a background thread.
------------- Commit messages: - cleanup - pagination - thread count - all controls - more tests - initial test Changes: https://git.openjdk.org/jfx/pull/1690/files Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1690&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8348423 Stats: 1224 lines in 3 files changed: 1097 ins; 125 del; 2 mod Patch: https://git.openjdk.org/jfx/pull/1690.diff Fetch: git fetch https://git.openjdk.org/jfx.git pull/1690/head:pull/1690 PR: https://git.openjdk.org/jfx/pull/1690
