tree e835dd0399199e9c9d23e8d4dc1e416a3e53dc90
parent 53f0f79da852e72d6f8df4b673509b1c561b6d99
author Colby Ranger <cranger@google.com> 1332523151 -0700
committer Colby Ranger <cranger@google.com> 1332803216 -0700

Added GroupMembership for group membership checks.

This replaces existing uses of a Set to determine membership and
will make it possible to integrate with group systems that do not
allow efficient enumentation of memberships.

Change-Id: Iba9842ca1a355fc100fb4a02d7954d89032cdba0