I think this is probably due to one of Evan's recent theme changes. Evan, can you please take a look?

oshima@, are you using a custom browser theme in the video?

no, it's default one.

thanks for report, got over-zealous deleting stuff.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/434b901825d725fb21e7a98ab2f27b128c504159

commit 434b901825d725fb21e7a98ab2f27b128c504159
Author: estade <estade@chromium.org>
Date: Mon Oct 10 20:40:47 2016

Fix new tab button (broken when removing pre-MD code).

BUG= 653905 

Review-Url: https://codereview.chromium.org/2401423004
Cr-Commit-Position: refs/heads/master@{#424230}

[modify] https://crrev.com/434b901825d725fb21e7a98ab2f27b128c504159/chrome/browser/ui/views/tabs/tab_strip.cc

oops, guess I need to merge this.

 Issue 658615  has been merged into this issue.

https://codereview.chromium.org/2447833002/

merged

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/15762bd6c5d58d85a75fb4ebcb21be18ed6040ee

commit 15762bd6c5d58d85a75fb4ebcb21be18ed6040ee
Author: Evan Stade <estade@chromium.org>
Date: Mon Oct 24 17:48:42 2016

Fix new tab button (broken when removing pre-MD code).

BUG= 653905 

Review-Url: https://codereview.chromium.org/2401423004
Cr-Commit-Position: refs/heads/master@{#424230}
(cherry picked from commit 434b901825d725fb21e7a98ab2f27b128c504159)

Review URL: https://codereview.chromium.org/2447833002 .

Cr-Commit-Position: refs/branch-heads/2883@{#241}
Cr-Branched-From: 614d31daee2f61b0180df403a8ad43f20b9f6dd7-refs/heads/master@{#423768}

[modify] https://crrev.com/15762bd6c5d58d85a75fb4ebcb21be18ed6040ee/chrome/browser/ui/views/tabs/tab_strip.cc

This issue has been approved for a merge. Please merge the fix to any appropriate branches as soon as possible!

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Verified on ChromeOS 8872.35.0, 55.0.2883.35

[Automated comment] removing mislabelled merge-merged-2840