1) Use a recent enough linux build so you're using GTK3 2) Be in the GTK theme. 3) Leave it up for awhile so you get the chrome update icon (or just hax the code so it is in this state). 3) Observe screenshot.
The following revision refers to this bug: https://chromium.googlesource.com/chromium/src.git/+/597c3878ead7e6df748ca0fbe4ca6d9ad14bde85 commit 597c3878ead7e6df748ca0fbe4ca6d9ad14bde85 Author: thomasanderson <thomasanderson@google.com> Date: Wed Mar 22 22:59:42 2017 Gtk3: Fallback on using Aura alert icon colors BUG= 704247 R=erg@chromium.org Review-Url: https://codereview.chromium.org/2771603003 Cr-Commit-Position: refs/heads/master@{#458916} [modify] https://crrev.com/597c3878ead7e6df748ca0fbe4ca6d9ad14bde85/chrome/browser/ui/libgtkui/native_theme_gtk3.cc
Comment 1 by bugdroid1@chromium.org
, Mar 22 2017