RFR: 8281569: Create tests for Frame.setMinimumSize() method [v3]

[Srinivas Mandalika]

> Create tests for setMinimumSize functionality
> Create a test which verifies that on increasing the Frame's minimumSize, it gets reflected in the subsequent getSize call
> Create a test which verifies that on frame resizes back to minimumSize on calling pack.

Srinivas Mandalika has updated the pull request incrementally with one additional commit since the last revision:

  Review comments fixed: volatile frame accessed across threads

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/7444/files
  - new: https://git.openjdk.java.net/jdk/pull/7444/files/f679256f..5303064d

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=7444&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=7444&range=01-02

  Stats: 4 lines in 2 files changed: 1 ins; 1 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7444.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7444/head:pull/7444

PR: https://git.openjdk.java.net/jdk/pull/7444