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This makes sure that the size of the highlight (which is also
the 'small' part of the ripple animation) corresponds to the shelf
size.

This results in no behavior change in the old UI, and fixes a glitch
in the new one.

Bug: 877563
Change-Id: I93c0fa90e22ded53e77b2b099e852851821f62a1
Reviewed-on: https://chromium-review.googlesource.com/1189186Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Manu Cornet <manucornet@chromium.org>
Cr-Commit-Position: refs/heads/master@{#586293}