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Prevents the focusing animation when the popup is displayed.
Also resets alpha levels of the edit and steady view post animation to
ensure correct behaviour if the non-animated focusing/defocusing is
triggered multiple times rapidly (more of a theoretical scenario).

Bug: 866882
TBR: marq@chromium.org
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: Ib00aa7d4a5ffe871260b4272ad9b2ca8494ba952
Reviewed-on: https://chromium-review.googlesource.com/1151347
Commit-Queue: Stepan Khapugin <stkhapugin@chromium.org>
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579737}