RFR: 8328570: Convert closed JViewport manual applet tests to main [v3]

[Prasanta Sadhukhan]

> Few closed manual applet JViewport tests are converted to main based and opensourced

Prasanta Sadhukhan has updated the pull request incrementally with one additional commit since the last revision:

  formatting

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Changes:
  - all: https://git.openjdk.org/jdk/pull/18418/files
  - new: https://git.openjdk.org/jdk/pull/18418/files/395730f3..8e177faa

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18418&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18418&range=01-02

  Stats: 3 lines in 3 files changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/18418.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18418/head:pull/18418

PR: https://git.openjdk.org/jdk/pull/18418