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This patch adds the TouchlessUiController class that is created through
AppHooks. The class defines an interface for downstream classes to
implement.

Bug: 930785
Change-Id: I9ea09d6a064d36d38cc024249724ae57d8d10551
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1483392Reviewed-by: Yaron Friedman <yfriedman@chromium.org>
Reviewed-by: Michael Thiessen <mthiesse@chromium.org>
Commit-Queue: Matthew Jones <mdjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#641714}