[jdk11u-dev] RFR: 8306430: Open source some AWT tests related to TextComponent and Toolkit

[Andrew Lu]

I backport this for parity with 11.0.21-oracle.

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Commit messages:
 - Backport 36ec05d52a79185d8c6669713fd17933128c032a

Changes: https://git.openjdk.org/jdk11u-dev/pull/2132/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2132&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8306430
  Stats: 562 lines in 5 files changed: 562 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2132.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2132/head:pull/2132

PR: https://git.openjdk.org/jdk11u-dev/pull/2132