Able to reproduce the issue on  Mac 10.11.6 using chrome latest canary  56.0.2923.0.

Please find the bisect information as below

Narrow Bisect::

Good Build : 56.0.2919.0—431801

Bad Build : 56.0.2920.0—432057

You are probably looking for a change made after 431907 (known good), but no later than 431908 (first known bad).
CHANGELOG URL:
The script might not always return single CL as suspectas some perf builds might get missing due to failure.
  https://chromium.googlesource.com/chromium/src/+log/97bd029159326fcd0792045a451b99cf9b20c913..2edc6f9145d91684f2151462fa20873c29b87b62

Possible suspect::
https://chromium.googlesource.com/chromium/src/+/2edc6f9145d91684f2151462fa20873c29b87b62

spqchan@ could you please look into this issue if it is related to your change,else please route this to an appropriate dev person.

Thanks,

Can confirm that this is caused by my change. The zoom decoration shouldn't be there in the first place, looks like my change exposes that

Just to update on the issue, still able to reproduce this issue on Mac 10.12.2 using latest canary #57.0.2969.0.

spqchan@ - Gentle Ping...!!

Could you please have a look into this issue.

Thanks...!!

FYI: Your bug is labelled as Stable Release Block, please make sure to land the fix and get it merged into the release branch ASAP so we can take it for next week's Beta release for Desktop. Thank you!

Able to reproduce the issue on Mac 10.12.1 using chrome version 57.0.2971.0.

spqchan@ Please look into this stable blocker issue.

Thanks,

Still able to reproduce this issue on Mac 10.12.2 using latest canary #57.0.2977.0.

spqchan@ - Could you please have a look into this issue as it has been marked as release block stable.

Thanks...!!

Since this is a minor UI bug , punting to M57 and reducing the priority.

The issue is happening because the decoration is still there when the zoom is set to the default. It just doesn't have a vector icon, since there's no MD icon for the default zoom. 

I'm going to fix this by hiding the Zoom UI when it's set to the default zoom, similar to the tooltip's behavior. Adding shrike@ since he had worked on the zoom decoration

CL WIP: https://codereview.chromium.org/2628703002/

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/d5a7a73975d123369dab9784b2897467a31b0ab8

commit d5a7a73975d123369dab9784b2897467a31b0ab8
Author: spqchan <spqchan@chromium.org>
Date: Fri Jan 13 22:13:39 2017

[Mac] Hide Zoom Decoration for Default Zoom

The new zoom decoration has no icon for the default zoom setting.
As a result, it should be set as invisible when the zoom is at the
default value.

BUG= 666266 

Review-Url: https://codereview.chromium.org/2628703002
Cr-Commit-Position: refs/heads/master@{#443694}

[modify] https://crrev.com/d5a7a73975d123369dab9784b2897467a31b0ab8/chrome/browser/ui/cocoa/location_bar/zoom_decoration.h
[modify] https://crrev.com/d5a7a73975d123369dab9784b2897467a31b0ab8/chrome/browser/ui/cocoa/location_bar/zoom_decoration.mm
[modify] https://crrev.com/d5a7a73975d123369dab9784b2897467a31b0ab8/chrome/browser/ui/cocoa/location_bar/zoom_decoration_browsertest.mm
[modify] https://crrev.com/d5a7a73975d123369dab9784b2897467a31b0ab8/chrome/browser/ui/cocoa/location_bar/zoom_decoration_unittest.mm

Verified on Mac OS 10.12.2 using chrome dev M57 #57.0.2984.0 and issue is fixed.

Hover effect is not seen when the ‘zoom’ icon is not there in omnibox.

Attaching screencast for reference.

Adding TE-Verified Labels.

Thanks!

Deleted: 666266.mp4 709 KB

	666266.mp4 709 KB View Download