The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/655534106723e235955ff0b4aec4cadddbd638ab

commit 655534106723e235955ff0b4aec4cadddbd638ab
Author: hunyadym <hunyadym@chromium.org>
Date: Tue Jan 24 19:59:29 2017

Add request and response messages related to AD Play user enrollment.

The ActiveDirectoryEnrollPlayUser RPC is used when a user logs in to
the device for the first time.
The ReportUserActivity RPC is called regularly to indicate if a user
account is used on the device, making it possible to garbage collect
accounts which are no longer present on the device.

BUG= 680953 

Review-Url: https://codereview.chromium.org/2633363002
Cr-Commit-Position: refs/heads/master@{#445787}

[modify] https://crrev.com/655534106723e235955ff0b4aec4cadddbd638ab/components/policy/proto/device_management_backend.proto