You are probably looking for a change made after 584469 (known good), but no later than 584470 (first known bad).

CHANGE-LOG URL:

The script might not always return single CL as suspect as some perf builds might get missing due to failure.

https://chromium.googlesource.com/chromium/src/+log/852475a834469a6ac06fc46dd1ce55a91202e182..c9953911862ace8cd2c114d1c52bd85cda3306ae

Suspect: https://chromium.googlesource.com/chromium/src/+/c9953911862ace8cd2c114d1c52bd85cda3306ae

@cyan: Could you please check whether this is caused with respect to your change, if not please help us in assigning it to the right owner.

Thank You..!!

FYI for further investigation:

CMD-B or CMD-T fixes the issue. I also noticed that the favicon of the first saved Bookmark is clipped in Incognito Mode's Bookmarks Bar. Also in this case, CMD-B or CMD-T or saving a second Bookmark fixes the issue.

Further information:

This is not only Incognito-related. It also happens in normal windows, when the Appstore Default Bookmark is deactivated (via right-click context menu).

BTW: Sorry, in comment 2 I meant SHIFT-CMD-B (and not CMD-B)

A screencast is attached which showing the missing text and the clipped favicon in normal window.

Deleted: Bug_Bookmarksbar.mov 6.5 MB

	Bug_Bookmarksbar.mov 6.5 MB View Download

One more information :)

In normal window, if you have the default App Store Bookmark deactivated and you quit and relaunch Chrome, the Bookmarks Bar becomes also blank.

I noticed that resizing the window also fixes the issue.

Deleted: relaunch.mov 3.3 MB

	relaunch.mov 3.3 MB View Download

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/2cbdecbb3f8f5b16a6a0745d0f16df9ead44d6e9

commit 2cbdecbb3f8f5b16a6a0745d0f16df9ead44d6e9
Author: Charlene Yan <cyan@chromium.org>
Date: Thu Aug 30 18:20:16 2018

Fixing the height of the bookmark bar and buttons on the bookmark bar.

Bug:  876690 ,  876682 ,  879154 
Change-Id: Ia72f26e9d7e0402868dd628fa2e10492b46a2cee
Reviewed-on: https://chromium-review.googlesource.com/1194728
Commit-Queue: Charlene Yan <cyan@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Bret Sepulveda <bsep@chromium.org>
Cr-Commit-Position: refs/heads/master@{#587664}
[modify] https://crrev.com/2cbdecbb3f8f5b16a6a0745d0f16df9ead44d6e9/chrome/browser/ui/layout_constants.cc
[modify] https://crrev.com/2cbdecbb3f8f5b16a6a0745d0f16df9ead44d6e9/chrome/browser/ui/layout_constants.h
[modify] https://crrev.com/2cbdecbb3f8f5b16a6a0745d0f16df9ead44d6e9/chrome/browser/ui/views/bookmarks/bookmark_bar_view.cc
[modify] https://crrev.com/2cbdecbb3f8f5b16a6a0745d0f16df9ead44d6e9/chrome/browser/ui/views/bookmarks/bookmark_bar_view.h

Update:

Rechecked the above issue on Mac (10.12.6, 10.13.1, 10.13.6, 10.14), Win (7, 8, 8.1, 10) & Linux (14.04 LTS) using latest canary version #70.0.3538.0 and the issue is found FIXED.
Hence, adding the respective labels.

Please refer the attached screen-cast.

Thank You..!!

Deleted: 876690_FIXED.mov 2.2 MB

	876690_FIXED.mov 2.2 MB View Download