[OpenJDK 2D-Dev] [9] Review Request: 8028486 java/awt/Window/WindowsLeak/WindowsLeak.java fails

[Sergey Bylokhov]

Hello,
Please review the fix for jdk9.

Bug evaluation was done by Anton:
http://mail.openjdk.java.net/pipermail/awt-dev/2016-April/011177.html

This is a cross-platform bug it affects d3d/ogl pipelines. The problem 
is that BufferedContex cached information to skip some native 
reconfigurations. But this cache cause a memory leak if some 
data(src/dst surfaces) was cached and there was no new rendering in this 
context(we create context per-d3d_device/ogl_config).

In the fix I changed all these caches to weak references. Note that i 
use a references as initial values instead of null, just to eliminate 
the null checks in the body of the method.

The test was updated to be more stable(flushed the EDT + flushed the 
Disposer thread).

Bug: https://bugs.openjdk.java.net/browse/JDK-8028486
Webrev can be found at: http://cr.openjdk.java.net/~serb/8028486/webrev.00

-- 
Best regards, Sergey.