[jdk11u-dev] RFR: 8306753: Open source several container AWT tests

[Andrew Lu]

I backport this for parity with 11.0.23-oracle.

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Commit messages:
 - Backport b372f28ad4b7c1f46e0070a930911542d4d1a032

Changes: https://git.openjdk.org/jdk11u-dev/pull/2448/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2448&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8306753
  Stats: 814 lines in 4 files changed: 814 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2448.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2448/head:pull/2448

PR: https://git.openjdk.org/jdk11u-dev/pull/2448