Close tray bubble before disabling UI for sign-in.

Close tray bubble before disabling UI for sign-in.

During Chrome OS sign-in we temperoraly block the UI, to prevent user
from interracting with UI elements, particullary with the system tray
menu. However, if system tray menu is opened before disabling the UI,
it remains opened after. Fixed this by closing the menu together with
disabling the UI.

BUG=497080
TEST=manually

Review URL: https://codereview.chromium.org/1187593006

Cr-Commit-Position: refs/heads/master@{#335133}

Committed: https://crrev.com/54491dc0ca9c5edbbc300e0e7cc56ad2beee3fe7
Cr-Commit-Position: refs/heads/master@{#335562}

[dzhioev (left Google), 2015-06-19 23:44:03]

dzhioev@chromium.org changed reviewers:
+ achuith@chromium.org

[dzhioev (left Google), 2015-06-19 23:44:16]

Hello, PTAL

[achuithb, 2015-06-19 23:52:06]

https://codereview.chromium.org/1194053003/diff/1/chrome/browser/chromeos/log...
File chrome/browser/chromeos/login/ui/webui_login_view.cc (right):

https://codereview.chromium.org/1194053003/diff/1/chrome/browser/chromeos/log...
chrome/browser/chromeos/login/ui/webui_login_view.cc:352: if (!enabled &&
tray->HasSystemBubble())
Could you please add a comment here summarizing what you have in the description
of this CL? It's not obvious from looking at the code.

[dzhioev (left Google), 2015-06-20 00:20:33]

Done.

[achuithb, 2015-06-22 18:53:24]

lgtm

[dzhioev (left Google), 2015-06-22 19:09:04]

The CQ bit was checked by dzhioev@chromium.org

[commit-bot: I haz the power, 2015-06-22 19:10:03]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1194053003/20001

[commit-bot: I haz the power, 2015-06-22 19:52:27]

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

[commit-bot: I haz the power, 2015-06-22 19:52:28]

Try jobs failed on following builders:
  linux_chromium_chromeos_ozone_rel_ng on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)

[dzhioev (left Google), 2015-06-22 20:21:38]

The CQ bit was checked by dzhioev@chromium.org

[commit-bot: I haz the power, 2015-06-22 20:22:55]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1194053003/20001

[commit-bot: I haz the power, 2015-06-22 21:20:39]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-06-22 21:21:31]

Patchset 2 (id:??) landed as
https://crrev.com/54491dc0ca9c5edbbc300e0e7cc56ad2beee3fe7
Cr-Commit-Position: refs/heads/master@{#335562}