<AWT Dev> [9] Review Request: 8011541 [TEST_BUG] closed/javax/swing/plaf/metal/MetalUtils/bug6190373.java fails NPE since 7u25b03

[Sergey Bylokhov]

Hello.
Please review the fix for jdk9.

The test emulate implementation of two applets inside one vm. It has two 
threads in two different threads groups, for one of them it creates an 
appcontext, and the test assumes that for the main thread the appcontext 
will be created automatically. This assumption is incorrect since we 
removed main appcontext long time ago.

In the fix:
- Everything from the main thread were moved to the second threads group
- Some synchronization and call to dispose() were added
- Now we iterates over all supported l&fs

I have checked that the updated test failed if the fix for JDK-6190373 
is reverted.
The test was moved to open.

Bug: https://bugs.openjdk.java.net/browse/JDK-8011541
Webrev can be found at: http://cr.openjdk.java.net/~serb/8011541/webrev.00
Only useful changes for convenience: 
http://cr.openjdk.java.net/~serb/8011541/webrev.diff

-- 
Best regards, Sergey.