RFR: JDK-8307381: Open Source JFrame, JIF related Swing Tests

[Harshitha Onkar]

Open sourced few JFrame, JIF related Swing tests.

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Commit messages:
 - initial commit

Changes: https://git.openjdk.org/jdk/pull/13787/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13787&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8307381
  Stats: 354 lines in 6 files changed: 354 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/13787.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13787/head:pull/13787

PR: https://git.openjdk.org/jdk/pull/13787