Following features are required:
* Determine AIX platform for GUI environment by using OSInfo
* Support High Color on CDE, OpenJDK just supports Medium Color [1]

[1] https://docs.oracle.com/cd/E19253-01/806-7492/fontsandcolors-15233/index.html

Initial review request:
http://mail.openjdk.java.net/pipermail/awt-dev/2018-November/014768.html

Test instruction:
ButtonTest.java
1. Run ButtonTest on AIX
Current color is bad-color.png,
Foreground should not be WHITE,
Background is same as disabled window manager's inactive color

SystemColorTest2
1. Run SystemColorTest2
Then check color setting

AIX dtwm/mwm issue was moved to JDK-8221082.