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This fixes an issue where the app list button position wasn't properly
calculated, causing the shelf icons to sometimes "bleed" over the app
list button.

Bug: 805612
Bug: 869649
Change-Id: Id774e15edbde8704789ed77bb36da194060fc3e9
Reviewed-on: https://chromium-review.googlesource.com/1173753Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Manu Cornet <manucornet@chromium.org>
Cr-Commit-Position: refs/heads/master@{#583026}