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On iOS 13 the keyboard hierarchy was updated. Composing a layout guide
makes it transparent to the current while staying compatible with iOS
12.

Bug: 996669
Change-Id: I480c9955f911731ac4a30acc83519c9de03ecfdc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1765669
Commit-Queue: Javier Ernesto Flores Robles <javierrobles@chromium.org>
Reviewed-by: Mark Cogan <marq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#692042}