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Tap inside the status area of auto-hide shelf with app list opened will
dismiss the app list and hide the shelf at the same time. This will
let the status area can't receive the gesture event to open the
corresponding tray bubble. This cl adds a lock for the auto-hide shelf
and uses it to lock the auto-hide shelf state if dismiss the app list
through tapping the status area of auto-hide shelf.

Bug: 902680
Change-Id: Ib946d57a25a664f3f0b80230d35a38a5c2cc1256
Reviewed-on: https://chromium-review.googlesource.com/c/1373012
Commit-Queue: Min Chen <minch@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#616036}