[jdk11u-dev] RFR: 8306137: Open source several AWT ScrollPane related tests

[Goetz Lindenmaier]

I backport this for parity with 11.0.21-oracle.

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Commit messages:
 - Backport 4becb7bcb6d8c24db5209dade77dbf2be057b2b0

Changes: https://git.openjdk.org/jdk11u-dev/pull/2030/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2030&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8306137
  Stats: 752 lines in 6 files changed: 752 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2030.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2030/head:pull/2030

PR: https://git.openjdk.org/jdk11u-dev/pull/2030