<AWT Dev> [9] Review Request: 8136858 Examine the usage of ThreadGroup.stop() in sun.awt.AppContext

[Sergey Bylokhov]

Hello.
Please review the fix for jdk9.

In the fix the call to ThreadGroup.stop() was wrapped in privileged 
block. The new test is provided, I have checked that it will fail if 
default permission "stopThread" will be removed from java.policy or if 
the call to ThreadGroup.stop() will be removed from AppContext.java

Bug: https://bugs.openjdk.java.net/browse/JDK-8136858
Webrev can be found at: http://cr.openjdk.java.net/~serb/8136858/webrev.02

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Best regards, Sergey.