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This patch adjusts the shelf width such that in pixel space there is no
gap left between the shelf and the edge of the display. The adjustment
is done via a utility method which can be used to adjust any bounds to
ensure that they cover the edge of the display or screen.

Bug: 843354
Change-Id: Ica9adfe6e21e7ae71ef8206e20507a372317c105
Component: Screen util, shelf
Reviewed-on: https://chromium-review.googlesource.com/1154040
Commit-Queue: Malay Keshav <malaykeshav@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579590}