tree c675f0692e11532978e9966532cc0437b45073f4
parent b83b5fa641847ee1d533253ba5e1a3e13913b9d9
author Phil Burk <philburk@google.com> 1438727935 -0700
committer Phil Burk <philburk@google.com> 1438727935 -0700

MidiManager: use ConcurrentHashMap

So that adding and removing device listeners is thread-safe.

Bug: 22909752
Change-Id: I1369ab53c865b54e6e5eb8ea3e8d437fdd1d7197
Signed-off-by: Phil Burk <philburk@google.com>