<Swing Dev> RFR: 8197825: [Test] Intermiitent timeout with javax/swing JColorChooser Test

[Prasanta Sadhukhan]

This test was failing in our nightly mach5 testing. Appropriate stability code in form of waitForIdle and delay is added.
mach5 job running for several iterations on all platforms is ok. Link in JBS.

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Commit messages:
 - 8197825: [Test] Intermiitent timeout with javax/swing JColorChooser Test

Changes: https://git.openjdk.java.net/jdk/pull/2220/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2220&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8197825
  Stats: 54 lines in 2 files changed: 26 ins; 16 del; 12 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2220.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2220/head:pull/2220

PR: https://git.openjdk.java.net/jdk/pull/2220