Add method to set manager property.

BUG=chromium-os:25976
TEST=none

Change-Id: Ic1b25c179ff658992a0150a58d58e9abba1fb672
Reviewed-on: https://gerrit.chromium.org/gerrit/18863
Reviewed-by: Jason Glasgow <jglasgow@chromium.org>
Reviewed-by: Ryo Hashimoto <hashimoto@chromium.org>
Tested-by: Nikita Kostylev <nkostylev@chromium.org>
Commit-Ready: Nikita Kostylev <nkostylev@chromium.org>
4 files changed