[jdk11u-dev] RFR: 8306718: Optimize and opensource some old AWT tests

[Andrew Lu]

I backport this for parity with 11.0.21-oracle.

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Commit messages:
 - Backport 9beae21864d18054ca3762ec989d51ff0660db84

Changes: https://git.openjdk.org/jdk11u-dev/pull/2085/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2085&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8306718
  Stats: 410 lines in 4 files changed: 410 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2085.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2085/head:pull/2085

PR: https://git.openjdk.org/jdk11u-dev/pull/2085