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To avoid maintaning dupe code, the logic to find the keyboard is
consolidated in the helper. The keyboard view and its best constraining
view can now be accessed as class properties.

Bug: 996669
Change-Id: I4da6883539375cf99a8edf82bbf9b8fec2ba82c6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1765470Reviewed-by: Mark Cogan <marq@chromium.org>
Commit-Queue: Javier Ernesto Flores Robles <javierrobles@chromium.org>
Cr-Commit-Position: refs/heads/master@{#691136}