<AWT Dev> [9] Review Request: 6345095 regression test EmptyClipRenderingTest fails

[Sergey Bylokhov]

Hello.
Please review the fix for jdk 9.
  - This test fails on osx because of rounded corners. Now it use 
undecorated frame.
  - On windows it fails, because sometimes the paint event was coming 
after we paint the Canvas. Now we redraw the Canvas after a paint event.
The test still fails on jdk where the corresponding bugs were not fixed.

Bug: https://bugs.openjdk.java.net/browse/JDK-6345095
Webrev can be found at: http://cr.openjdk.java.net/~serb/6345095/webrev.01
Diff: http://cr.openjdk.java.net/~serb/6345095/webrev_diff.01

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Best regards, Sergey.