Fix race in locale changes during DeviceLocalAccountTest

Fix race in locale changes during DeviceLocalAccountTest

OOBE shows the network selection screen first. This screen will change
the application locale when it finishes loading and once again when it
loses focus.

This CL ensures that tests wait until both events have happened before
proceeding so that locale switches initiated by the network selection
screen do not interfere with the locale switching code that is actually
under test.

BUG=214904, 241790
TEST=DeviceLocalAccountTest.SelectLanguageAndKeyboardWithTermsOfService
R=pneubeck@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=287350

[bartfab (slow), 2014-08-04 13:38:07]

Hi Philipp,

Could you take a look?

[pneubeck (no reviews), 2014-08-04 14:51:50]

lgtm

[bartfab (slow), 2014-08-04 14:58:37]

The CQ bit was checked by bartfab@chromium.org

[commit-bot: I haz the power, 2014-08-04 14:59:02]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/bartfab@chromium.org/423073009/20001

[bartfab (slow), 2014-08-04 16:29:08]

The CQ bit was unchecked by bartfab@chromium.org

[bartfab (slow), 2014-08-04 16:44:59]

The CQ bit was checked by bartfab@chromium.org

[commit-bot: I haz the power, 2014-08-04 16:45:38]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/bartfab@chromium.org/423073009/20001

[bartfab (slow), 2014-08-04 16:51:26]

Committed patchset #2 manually as 287350 (presubmit successful).