<Swing Dev> RFR: JDK-8273312 : [TESTBUG] sanity/client/SwingSet/src/ButtonDemoScreenshotTest.java fails intermittently on Windows OS.

[Amresh Sahu]

Problem: In Windows look and feel, Button(in test case ui) starts animating to show the selection and test case captures the animated button image to do the comparisons with initial button image and this comparison fails with Timeout Exception exception. 

Solution: TestHelper class provides the list of look and feel. One more method added to this class to exclude the windows look and feel.

This test has been tested  20 times on mach5 and It is passing.

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Commit messages:
 - JDK-8273312 : sanity/client/SwingSet/src/ButtonDemoScreenshotTest.java fails intermittently on Windows OS.
 - Merge pull request #5 from openjdk/master
 - Merge pull request #4 from openjdk/master
 - Merge pull request #3 from openjdk/master
 - Merge pull request #2 from openjdk/master

Changes: https://git.openjdk.java.net/jdk/pull/5380/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5380&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8273312
  Stats: 17 lines in 2 files changed: 16 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5380.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5380/head:pull/5380

PR: https://git.openjdk.java.net/jdk/pull/5380