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This will allow trigger scripts to automatically hide while the keyboard
is being displayed. Example video of the interaction is in the linked
bug.

Bug: b/173038438
Change-Id: I874f40c359710d7dd63886f703c5448df2636a0e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2532464
Commit-Queue: Clemens Arbesser <arbesser@google.com>
Reviewed-by: Mathias Carlen <mcarlen@chromium.org>
Reviewed-by: Marian Fechete <marianfe@google.com>
Cr-Commit-Position: refs/heads/master@{#826803}