Using WmDisplayObserver in ScreenPinningController.

Using WmDisplayObserver in ScreenPinningController.

BUG=705702
Review-Url: https://codereview.chromium.org/2777103005
Cr-Commit-Position: refs/heads/master@{#460169}
Committed: https://chromium.googlesource.com/chromium/src/+/65976c977c5695514909ff1cebe30e2dd6c2c60c

[Peng, 2017-03-28 14:51:22]

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

[commit-bot: I haz the power, 2017-03-28 14:52:03]

Dry run: 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, 2017-03-28 15:21:30]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2017-03-28 15:21:31]

Dry run: This issue passed the CQ dry run.

[Peng, 2017-03-28 15:31:02]

penghuang@chromium.org changed reviewers:
+ sky@chromium.org

[Peng, 2017-03-28 15:31:03]

Hi Scott, PTAL. Thanks.

[sky, 2017-03-28 17:30:01]

Nice! Thanks LGTM

[Peng, 2017-03-28 18:00:36]

The CQ bit was checked by penghuang@chromium.org

[commit-bot: I haz the power, 2017-03-28 18:00:57]

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, 2017-03-28 18:07:08]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1490724036925010, "parent_rev":
"543ae1bd4cddbfb3a2d744ef49c4566da676ab0f", "commit_rev":
"65976c977c5695514909ff1cebe30e2dd6c2c60c"}

[commit-bot: I haz the power, 2017-03-28 18:08:05]

Description was changed from

==========
Using WmDisplayObserver in ScreenPinningController.

BUG=705702
==========

to

==========
Using WmDisplayObserver in ScreenPinningController.

BUG=705702

Review-Url: https://codereview.chromium.org/2777103005
Cr-Commit-Position: refs/heads/master@{#460169}
Committed:
https://chromium.googlesource.com/chromium/src/+/65976c977c5695514909ff1cebe3...
==========

[commit-bot: I haz the power, 2017-03-28 18:08:06]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/65976c977c5695514909ff1cebe3...