I _think_ I had fixed that issue the morning of the bug bash but I need to verify the status in a recent build.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/3661ba434ae05df11f10618d7a858fed7e1c56cb

commit 3661ba434ae05df11f10618d7a858fed7e1c56cb
Author: Manu Cornet <manucornet@chromium.org>
Date: Tue Aug 14 20:59:10 2018

Fix a bug with shelf icon centering

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/1173753
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Manu Cornet <manucornet@chromium.org>
Cr-Commit-Position: refs/heads/master@{#583026}
[modify] https://crrev.com/3661ba434ae05df11f10618d7a858fed7e1c56cb/ash/shelf/shelf_view.cc