GitLab

Pin keyboard should be only visible when there is no virtul keyboard
displayed.
Observe virtual keyboard state in order to update pin keyboard visibility.

Bug: 799082
Change-Id: I9ef33faf699dfc78cdd09145f4c2aee43e52afab
Reviewed-on: https://chromium-review.googlesource.com/903414
Commit-Queue: Aga Wronska <agawronska@chromium.org>
Reviewed-by: Jacob Dufault <jdufault@chromium.org>
Cr-Commit-Position: refs/heads/master@{#537333}