That is strange. My changes currently in the Canary don't touch any controls below the tab strip.

LocationBarViewMac::OnChanged() updates the location_icon_decoration_ to show the search icon (actually, whatever icon is returned by OmniboxViewMac::ImageForResource(omnibox_view_->GetIcon())). ImageForResource() simply returns the result of calling ResourceBundle::GetNativeImageNamed().

GetNativeImageNamed(), which is overridden in resource_bundle_mac.mm, has a note about Material Design images overriding the same image from the standard packs. However, in the case of an MD match the returned NSImage contains only a single representation, regardless of how many MD packs at different scale factors there are. Because of the MD resource pack load order, that single representation is always the 1x version.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/945e2bc8771685c37cfcb0fa6b855d2afefc05ed

commit 945e2bc8771685c37cfcb0fa6b855d2afefc05ed
Author: shrike <shrike@chromium.org>
Date: Mon Mar 07 20:50:45 2016

Make sure images loaded from MD resource packs contain all reps (Mac).

A bug in GetNativeImageNamed() causes an early out when collecting
image representations from MD packs. The result is NSImages containing
just the 1x representation.

BUG= 592161 

Review URL: https://codereview.chromium.org/1771963002

Cr-Commit-Position: refs/heads/master@{#379632}

[modify] https://crrev.com/945e2bc8771685c37cfcb0fa6b855d2afefc05ed/ui/base/resource/resource_bundle_mac.mm