Copies MruWindowTrackerTest over for mash

Copies MruWindowTrackerTest over for mash

This is an exact copy of that for aura (with includes sanitized for
check deps). I'm copying this first so it's easy to see what changes.

I'm TBRing as this is just a file copy, and the file isn't compiled
yet.

BUG=617789
TEST=test only change
R=jamescook@chromium.org
TBR=jamescook@chromium.org

Committed: https://crrev.com/e62002a691d8bbcd96b34284e39c81b2784832e6
Cr-Commit-Position: refs/heads/master@{#398373}

[sky, 2016-06-07 19:55:05]

The CQ bit was checked by sky@chromium.org

[commit-bot: I haz the power, 2016-06-07 20:02:39]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2042423002/1

[commit-bot: I haz the power, 2016-06-07 21:27:57]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-06-07 21:29:13]

Description was changed from

==========
Copies MruWindowTrackerTest over for mash

This is an exact copy of that for aura (with includes sanitized for
check deps). I'm copying this first so it's easy to see what changes.

I'm TBRing as this is just a file copy, and the file isn't compiled
yet.

BUG=617789
TEST=test only change
R=jamescook@chromium.org
TBR=jamescook@chromium.org
==========

to

==========
Copies MruWindowTrackerTest over for mash

This is an exact copy of that for aura (with includes sanitized for
check deps). I'm copying this first so it's easy to see what changes.

I'm TBRing as this is just a file copy, and the file isn't compiled
yet.

BUG=617789
TEST=test only change
R=jamescook@chromium.org
TBR=jamescook@chromium.org

Committed: https://crrev.com/e62002a691d8bbcd96b34284e39c81b2784832e6
Cr-Commit-Position: refs/heads/master@{#398373}
==========

[commit-bot: I haz the power, 2016-06-07 21:29:14]

Patchset 1 (id:??) landed as
https://crrev.com/e62002a691d8bbcd96b34284e39c81b2784832e6
Cr-Commit-Position: refs/heads/master@{#398373}