RFR: 8306137: Open source several AWT ScrollPane related tests [v3]

[Tejesh R]

> Open source few AWT ScrollPane related tests.

Tejesh R has updated the pull request incrementally with one additional commit since the last revision:

  Updated ScrollPaneWindowsTest.java

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/13621/files
  - new: https://git.openjdk.org/jdk/pull/13621/files/ffad753e..57f707a1

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=13621&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=13621&range=01-02

  Stats: 56 lines in 1 file changed: 18 ins; 17 del; 21 mod
  Patch: https://git.openjdk.org/jdk/pull/13621.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13621/head:pull/13621

PR: https://git.openjdk.org/jdk/pull/13621