RFR: 8306812: Open source several AWT Miscellaneous tests [v3]

[Tejesh R]

> Open source few AWT Miscellaneous ( Panel, Popup, robot and scrollbar) tests.

Tejesh R has updated the pull request incrementally with two additional commits since the last revision:

 - Updated based on review comments
 - Updated based on review comments

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Changes:
  - all: https://git.openjdk.org/jdk/pull/13828/files
  - new: https://git.openjdk.org/jdk/pull/13828/files/e7d0a3ac..1ba7c25f

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=13828&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=13828&range=01-02

  Stats: 8 lines in 3 files changed: 5 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/13828.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13828/head:pull/13828

PR: https://git.openjdk.org/jdk/pull/13828