Import: Emulate new methods for Comparator in Java 8.
Import: Emulate new methods for Comparator in Java 8.

commit cd7a1b073de9cc651ccff16bf901f5140cf0a6aa
Author: Colin Alworth <niloc132@gmail.com>
Date:   Fri Mar 18 11:39:31 2016 -0500

    Emulate new methods for Comparator in Java 8.

    Started from https://gwt-review.googlesource.com/#/c/13730/

    Change-Id: I0d4c6da1a260fb3d89cf528d604b1c632d5adba4

PiperOrigin-RevId: 122898602

google/j2cl,google/j2cl,google/j2cl,google/j2cl,google/j2cl