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This change makes the current touchable area available to the UI code,
through UIDelegate. It also renames UIController::UpdateTouchableArea to
UIController::OnTouchableAreaChanged to be consistent with the other
methods on UIController.

The goal of this change is to make it possible to attach the UI to a new
controller.

This is a pure refactoring. It should not have any visible effect.

Bug: 806868
Change-Id: Ifa6dca04d45071f73ce431bcadc36e58c37fe582
Reviewed-on: https://chromium-review.googlesource.com/c/1447872Reviewed-by: Stephane Zermatten <szermatt@chromium.org>
Reviewed-by: Mathias Carlen <mcarlen@chromium.org>
Commit-Queue: Stephane Zermatten <szermatt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#629095}