RFR: JDK-8328753 : Open source few Undecorated Frame tests [v3]

[Harshitha Onkar]

> Following tests are converted to main and open-sourced:
> 
> - /java/awt/Frame/FrameDialogMixedTest.java- Converted to main/manual using PassFailJFrame.
> - /java/awt/Frame/MaximizeUndecoratedTest.java - Automated
> - /java/awt/Frame/MinimizeUndecoratedTest.java - Automated

Harshitha Onkar has updated the pull request incrementally with one additional commit since the last revision:

  RuntimeException thrown

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Changes:
  - all: https://git.openjdk.org/jdk/pull/18523/files
  - new: https://git.openjdk.org/jdk/pull/18523/files/ff15a9d8..9c2b2939

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18523&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18523&range=01-02

  Stats: 2 lines in 2 files changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/18523.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18523/head:pull/18523

PR: https://git.openjdk.org/jdk/pull/18523