RFR: 8306638: Open source some AWT tests related to datatransfer and Toolkit [v2]

[Jayathirth D V]

> This PR open sources some tests related to AWT datatransfer and Toolkit.

Jayathirth D V has updated the pull request incrementally with one additional commit since the last revision:

  Update after review comments

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Changes:
  - all: https://git.openjdk.org/jdk/pull/13642/files
  - new: https://git.openjdk.org/jdk/pull/13642/files/677874f0..6b0f6511

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=13642&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=13642&range=00-01

  Stats: 32 lines in 5 files changed: 9 ins; 1 del; 22 mod
  Patch: https://git.openjdk.org/jdk/pull/13642.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13642/head:pull/13642

PR: https://git.openjdk.org/jdk/pull/13642