[jfx21u] Integrated: 8313177: Web Workers timeout with Webkit 616.1

[Jay Bhaskar]

clean backport for jfx21u. The fix is for the js web worker timeout ( some tests fail to finish)

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Commit messages:
 - Backport 5f5e54feb2e816dcb351a28862c798117c3f81e8

Changes: https://git.openjdk.org/jfx21u/pull/5/files
 Webrev: https://webrevs.openjdk.org/?repo=jfx21u&pr=5&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8313177
  Stats: 117 lines in 4 files changed: 110 ins; 7 del; 0 mod
  Patch: https://git.openjdk.org/jfx21u/pull/5.diff
  Fetch: git fetch https://git.openjdk.org/jfx21u.git pull/5/head:pull/5

PR: https://git.openjdk.org/jfx21u/pull/5