[9] Review Request for 8157137: [PIT] [TEST_BUG] compilation failed for some tests from jdk/test/java/awt/mixing/AWT_Mixing (can't find Helper)

[Yuri Nesterenko]

Colleagues,

please review this test-only fix for JDK-8157137

CR: https://bugs.openjdk.java.net/browse/JDK-8157137
Webrev: http://cr.openjdk.java.net/~yan/8157137/webrev.00/

The reason these tests worked for me was, I had all necessary
compiled files in my repo clones on all test machines.
To reproduce the failures, I had to create a clean clone
and carefully remove the intermediate stuff every time.

Thanks,
-yan