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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

Review URL: https://codereview.chromium.org/423073009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@287350 0039d316-1c4b-4281-b951-d872f2087c98