The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/85452498d9ea49c953d98d443b37b21b6dc07338

commit 85452498d9ea49c953d98d443b37b21b6dc07338
Author: Manu Cornet <manucornet@chromium.org>
Date: Mon Aug 27 19:05:40 2018

CrOS shelf: indicator color, size & alpha tweaks

This changes the color, alpha and size of indicators according to the
spec (see linked bug for the spec).

Bug:  877351 
Change-Id: I6237ab1f0d4727907b344147a0cf816319192b26
Reviewed-on: https://chromium-review.googlesource.com/1189196
Commit-Queue: Manu Cornet <manucornet@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#586356}
[modify] https://crrev.com/85452498d9ea49c953d98d443b37b21b6dc07338/ash/shelf/shelf_button.cc