[jdk11u-dev] RFR: 8306683: Open source several clipboard and color AWT tests

[Andrew Lu]

I backport this for parity with 11.0.23-oracle.

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Commit messages:
 - Backport 1c2dadc31e8b732d43df5494437720bfbc3f5c8b

Changes: https://git.openjdk.org/jdk11u-dev/pull/2504/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2504&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8306683
  Stats: 570 lines in 4 files changed: 570 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2504.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2504/head:pull/2504

PR: https://git.openjdk.org/jdk11u-dev/pull/2504