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We want to show a visual indicator in the status tray when the language
toggle is available (in demo mode). It should show the abbreviation of
the locale such as "DA".

The only caveat is that the IME indicator may also be shown in the same
place, so showing two strings with the same format may confuse users.
PM confirms that we want to hide the IME indicator as long as the
locale indicator is available.

Bug: 877749
Change-Id: Ieca21dd46c846b81147bd44798b2deb25d9d57fa
Reviewed-on: https://chromium-review.googlesource.com/c/1370886Reviewed-by: Tetsui Ohkubo <tetsui@chromium.org>
Commit-Queue: Wenzhao (Colin) Zang <wzang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#615740}