RFR: 8241307: Marlin renderer is used by default in jdk8u

[Laurent Bourgès]

Please review this jdk8u specific patch to restore the default behaviour
(Marlin renderer is not the default RenderingEngine).


Note: this impacts the coming JDK8 b252 release too, sorry.



JBS: https://bugs.openjdk.java.net/browse/JDK-8241307

webrev: http://cr.openjdk.java.net/~lbourges/marlin8u/marlin-8241307.0/


Changes:
- fixed the class order sun.java2d.pipe.RenderingEngine files to ensure
Marlin is not at the last place (default service)
- new test DefaultRenderingEngine that fails if Marlin is the default
rendering engine

Build: OK
JTreg fails without patch:
runner starting test: sun/java2d/marlin/DefaultRenderingEngine.java
runner finished test: sun/java2d/marlin/DefaultRenderingEngine.java
Failed. Execution failed: `main' threw exception:
java.lang.RuntimeException: Marlin must not be the default RenderingEngine
in jdk8u !

JTreg passes with patch:
runner starting test: sun/java2d/marlin/DefaultRenderingEngine.java
runner finished test: sun/java2d/marlin/DefaultRenderingEngine.java
Passed. Execution successful

PS: Thanks to Alexander to have reported this problem today.

Laurent