RFR: 8315825: Open some swing tests

[Alisen Chung]

Opening some swing tests:
1 javax/swing/LayoutComparator/4907772/bug4907772.java
2 javax/swing/LayoutComparator/4979794/bug4979794.java
3 javax/swing/LegacyGlueFocusTraversalPolicy/4765272/bug4765272.java
4 javax/swing/RootPaneChecking/RootPaneChecking.java

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Commit messages:
 - moving tests to open
 - named test frames
 - init commit

Changes: https://git.openjdk.org/jdk/pull/15830/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15830&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8315825
  Stats: 445 lines in 4 files changed: 445 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/15830.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15830/head:pull/15830

PR: https://git.openjdk.org/jdk/pull/15830