[jdk11u-dev] RFR: 8305874: Open source AWT Key, Text Event related tests

[Amos Shi]

Backport of [JDK-8305874](https://bugs.openjdk.org/browse/JDK-8305874)

Testing
- Local: Test passed
  - `DeleteKeyTyped.java`: Test results: passed: 1
  - `EscapeKeyTyped.java`: Test results: passed: 1
  - `ShiftF10Test.java`: Test results: no tests selected
  - `ContainerEventChildTest.java`: Test results: passed: 1
  - `InitialTextEventTest.java`: Test results: passed: 1
- Pipeline: 
- Testing Machine:

-------------

Commit messages:
 - Backport d6cf4aa1551df591c7bc75cb8c5e90d57630ca2a

Changes: https://git.openjdk.org/jdk11u-dev/pull/2652/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2652&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8305874
  Stats: 547 lines in 5 files changed: 547 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2652.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2652/head:pull/2652

PR: https://git.openjdk.org/jdk11u-dev/pull/2652