RFR: 8353957: Open source several AWT ScrollPane tests - Batch 1

[Tejesh R]

Open source these AWT ScrollPane tests:

java/awt/ScrollPane/ScrollPaneFlicker/ScrollPaneFlicker.java
java/awt/ScrollPane/ScrollbarsAsNeeded/ScrollbarsAsNeededTest.java
java/awt/ScrollPane/ScrollPanePaint/ScrollPanePaint.java
java/awt/ScrollPane/ScrollPositionTest/ScrollPositionTest.java

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

Commit messages:
 - Open source
 - Open source

Changes: https://git.openjdk.org/jdk/pull/24684/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24684&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8353957
  Stats: 525 lines in 5 files changed: 525 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/24684.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24684/head:pull/24684

PR: https://git.openjdk.org/jdk/pull/24684