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Show a locale feature button in the unified system tray in demo
mode. The UI is implemented in //ash/system, but the data should come
from //chrome.

The mock is in go/CrosDemoLanguage. No additional spec is needed: the
UI is consistent with other buttons in the system tray. The change is
approved by UI review.

Bug: 877749
Change-Id: I23a88584845e432b7762aeac03ab86d659cca07c
Reviewed-on: https://chromium-review.googlesource.com/c/1321775
Commit-Queue: Wenzhao (Colin) Zang <wzang@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Stefan Kuhne <skuhne@chromium.org>
Reviewed-by: Oliver Chang <ochang@chromium.org>
Reviewed-by: Michael Giuffrida <michaelpg@chromium.org>
Reviewed-by: Tetsui Ohkubo <tetsui@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608557}