hg: jdk9/sandbox/nashorn: 8139038: cleanup and documentation around JSAdapter

[chris.hegarty at oracle.com]

Changeset: 11b48db399bf
Author:    mhaupt
Date:      2015-10-07 14:00 +0200
URL:       http://hg.openjdk.java.net/jdk9/sandbox/nashorn/rev/11b48db399bf

8139038: cleanup and documentation around JSAdapter
Reviewed-by: attila, hannesw

! src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/objects/NativeJSAdapter.java
! test/script/basic/jsadapter.js
! test/script/basic/jsadapter.js.EXPECTED