The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/platform/arc-camera/+/e2688df9997f7267ca4ad5b25dcfa677d2982f18

commit e2688df9997f7267ca4ad5b25dcfa677d2982f18
Author: Daniel Hung-yu Wu <hywu@chromium.org>
Date: Mon Jun 05 13:28:29 2017

camera3_test: close device on another thread in module tests

Spawn another thread in Camera3Module to close the camera devices so as
to simulate the behavior of hal_adapter.

BUG= chromium:726206 
TEST='emerge-elm arc-camera3-test'
     'sudo -u arc-camera -g arc-camera /usr/bin/arc_camera3_test'

Change-Id: I646aa459d9a80ae1cf7c6a10f09e790fe7336ba1
Reviewed-on: https://chromium-review.googlesource.com/523164
Commit-Ready: Hung-yu Wu <hywu@chromium.org>
Tested-by: Hung-yu Wu <hywu@chromium.org>
Reviewed-by: Heng-ruey Hsu <henryhsu@google.com>

[modify] https://crrev.com/e2688df9997f7267ca4ad5b25dcfa677d2982f18/camera3_test/camera3_module_fixture.h
[modify] https://crrev.com/e2688df9997f7267ca4ad5b25dcfa677d2982f18/camera3_test/camera3_module_test.cc