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Currently when keyboard bounds change, KeyboardController notifies
the ChromeKeyboardUI to update the viewports of web contents on the
screen. This adds cruft to the KeyboardUI interface and will pose
problems for mash as well.

Alternatively, we could flip the relationship and have something in
Chrome observing keyboard bounds changes. This simplifies the
KeyboardUI interface and integrates nicely with the existing mojo
set up.

Bug: 845780
Change-Id: I0be697351f52619863f93e2b42dc263cd9dbab82
Reviewed-on: https://chromium-review.googlesource.com/c/1328481Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Commit-Queue: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609444}