RFR: 8306137: Open source several AWT ScrollPane related tests

[Alexey Ivanov]

On Mon, 24 Apr 2023 17:39:17 GMT, Tejesh R <tr at openjdk.org> wrote:

> Open source few AWT ScrollPane related tests.

I thought the preferred layout for tests is to use a flat layout without creating *additional folder* for each test.

So, `test/jdk/java/awt/ScrollPane/ComponentScrollTest/ComponentScrollTest.java` should be under `ScrollPane`: `test/jdk/java/awt/ScrollPane/ComponentScrollTest.java`.

Similarly, `test/jdk/java/awt/ScrollPane/ScrollPaneInsets/ScrollPaneExtraScrollBar.java` goes to `test/jdk/java/awt/ScrollPane/ScrollPaneExtraScrollBar.java`.

The test `test/jdk/java/awt/ScrollPane/RemoveChild` consists of two .java source files. Can the Semaphore class be moved into `ScrollPaneRemoveAdd.java` as a static nested class?

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PR Review: https://git.openjdk.org/jdk/pull/13621#pullrequestreview-1398613298