RFR: 8306067: Open source AWT Graphics,GridBagLayout related tests

[Prasanta Sadhukhan]

This opensources few AWT Graphics & GridBagLayout tests

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Commit messages:
 - 8306067: Open source AWT Graphics,GridBagLayout related tests

Changes: https://git.openjdk.org/jdk/pull/13570/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13570&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8306067
  Stats: 302 lines in 4 files changed: 302 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/13570.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13570/head:pull/13570

PR: https://git.openjdk.org/jdk/pull/13570