RFR: JDK-8355429 : Open source ProgressMonitor test

[Harshitha Onkar]

javax/swing/ProgressMonitor/bug4401480.java open-sourced

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Commit messages:
 - JProgressMonitor test

Changes: https://git.openjdk.org/jdk/pull/24833/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24833&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8355429
  Stats: 101 lines in 1 file changed: 101 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/24833.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24833/head:pull/24833

PR: https://git.openjdk.org/jdk/pull/24833