Provide extended modifiers in ActionEvent

A DESCRIPTION OF THE REQUEST :
JDK-8143077 deprecated _MASK constants in favor of _DOWN_MASK constants in Java 9.

But ActionEvent does not provide extended modifiers (there's no getModifiersEx() method in this class).

Can you please add a "public int getModifiersEx()" method in ActionEvent so that it behaves like InputEvent?

JUSTIFICATION :
Makes the migration 8 -> 9 harder