No toolbar updates while animating tab stack

No toolbar updates while animating tab stack

- When leaving the tab switcher, don't update the toolbar button states.  This can cause
the home button to be displayed early.

BUG=497602
Committed: https://crrev.com/d90c1942a225abc638d1b17945e7ad87f93ca914
Cr-Commit-Position: refs/heads/master@{#333575}

[David Trainor- moved to gerrit, 2015-06-09 19:11:27]

dtrainor@chromium.org changed reviewers:
+ tedchoc@chromium.org

[David Trainor- moved to gerrit, 2015-06-09 19:11:28]

ptal thanks.

[Ted C, 2015-06-09 19:18:19]

On 2015/06/09 19:11:28, David Trainor wrote:
> ptal thanks.

lgtm

[David Trainor- moved to gerrit, 2015-06-09 20:51:38]

The CQ bit was checked by dtrainor@chromium.org

[commit-bot: I haz the power, 2015-06-09 20:52:49]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1169233002/1

[commit-bot: I haz the power, 2015-06-09 21:20:19]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-06-09 21:21:15]

Patchset 1 (id:??) landed as
https://crrev.com/d90c1942a225abc638d1b17945e7ad87f93ca914
Cr-Commit-Position: refs/heads/master@{#333575}