More user id tracking for mus:

More user id tracking for mus:

Adds UserIdTracker to track set of known/valid user ids.

Start of adding test coverage for multiple windowmanagers per treehost
along with a handful of fixes.

BUG=590955
TEST=covered by tests
R=ben@chromium.org

Committed: https://crrev.com/1a8a5c27a8a9189bc2ef5069e66e5c44bd1808c4
Cr-Commit-Position: refs/heads/master@{#379156}

[Ben Goodger (Google), 2016-03-03 23:57:36]

lgtm

[sky, 2016-03-03 23:58:15]

The CQ bit was checked by sky@chromium.org

[commit-bot: I haz the power, 2016-03-03 23:58:36]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1757403002/40001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1757403002/40001

[commit-bot: I haz the power, 2016-03-04 00:42:35]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2016-03-04 00:43:37]

Description was changed from

==========
More user id tracking for mus:

Adds UserIdTracker to track set of known/valid user ids.

Start of adding test coverage for multiple windowmanagers per treehost
along with a handful of fixes.

BUG=590955
TEST=covered by tests
R=ben@chromium.org
==========

to

==========
More user id tracking for mus:

Adds UserIdTracker to track set of known/valid user ids.

Start of adding test coverage for multiple windowmanagers per treehost
along with a handful of fixes.

BUG=590955
TEST=covered by tests
R=ben@chromium.org

Committed: https://crrev.com/1a8a5c27a8a9189bc2ef5069e66e5c44bd1808c4
Cr-Commit-Position: refs/heads/master@{#379156}
==========

[commit-bot: I haz the power, 2016-03-04 00:43:38]

Patchset 3 (id:??) landed as
https://crrev.com/1a8a5c27a8a9189bc2ef5069e66e5c44bd1808c4
Cr-Commit-Position: refs/heads/master@{#379156}