Wire up CursorManager for DesktopWindowTreeHostMus

Wire up CursorManager for DesktopWindowTreeHostMus

This change makes DesktopWindowTreeHostMus use almost the same cursor
manager as NativeWidgetMus.

BUG=660994
TEST=none
R=erg@chromium.org

Committed: https://crrev.com/f71b727b75294db523d5ed01b4b7cd0c57f4b9c3
Cr-Commit-Position: refs/heads/master@{#435779}

[sky, 2016-12-01 22:07:28]

The CQ bit was checked by sky@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-12-01 22:07:54]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[Elliot Glaysher, 2016-12-01 22:34:11]

lgtm

[sky, 2016-12-01 22:47:20]

The CQ bit was unchecked by sky@chromium.org

[sky, 2016-12-01 22:47:25]

The CQ bit was checked by sky@chromium.org

[commit-bot: I haz the power, 2016-12-01 22:47:55]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-12-01 23:59:05]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1480632445147120, "parent_rev":
"731f9e1bae5862a45705a586d82cdd84ea9de877", "commit_rev":
"401dc1c00bcbcedad93ec3a72f4fd43e11525c0f"}

[commit-bot: I haz the power, 2016-12-01 23:59:38]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-12-02 00:03:21]

Description was changed from

==========
Wire up CursorManager for DesktopWindowTreeHostMus

This change makes DesktopWindowTreeHostMus use almost the same cursor
manager as NativeWidgetMus.

BUG=660994
TEST=none
R=erg@chromium.org
==========

to

==========
Wire up CursorManager for DesktopWindowTreeHostMus

This change makes DesktopWindowTreeHostMus use almost the same cursor
manager as NativeWidgetMus.

BUG=660994
TEST=none
R=erg@chromium.org

Committed: https://crrev.com/f71b727b75294db523d5ed01b4b7cd0c57f4b9c3
Cr-Commit-Position: refs/heads/master@{#435779}
==========

[commit-bot: I haz the power, 2016-12-02 00:03:22]

Patchset 1 (id:??) landed as
https://crrev.com/f71b727b75294db523d5ed01b4b7cd0c57f4b9c3
Cr-Commit-Position: refs/heads/master@{#435779}