RFR: 8311881: jdk/javax/swing/ProgressMonitor/ProgressTest.java does not show the ProgressMonitorInputStream all the time

[Prasanta Sadhukhan]

Due to some threading issues, Progress Monitor is not shown in macos..
Seems like we need to call ProgressMonitor swing component in EDT..

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Commit messages:
 - 8311881: jdk/javax/swing/ProgressMonitor/ProgressTest.java does not show the ProgressMonitorInputStream all the time
 - 8311881: jdk/javax/swing/ProgressMonitor/ProgressTest.java does not show the ProgressMonitorInputStream all the time
 - Merge branch 'master' of github.com:prsadhuk/jdk
 - Merge remote-tracking branch 'upstream/master'
 - Merge remote-tracking branch 'upstream/master'
 - Revert "Fix"
 - Fix

Changes: https://git.openjdk.org/jdk/pull/14844/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14844&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8311881
  Stats: 11 lines in 1 file changed: 6 ins; 1 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/14844.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14844/head:pull/14844

PR: https://git.openjdk.org/jdk/pull/14844