You are probably looking for a change made after 580948 (known good), but no later than 580949 (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/631ac11aae294abc8b5a100a09e59af59aa6e229..c2111e0695751dcd6833f86930ea7905daef9494

Suspect: https://chromium.googlesource.com/chromium/src/+/c2111e0695751dcd6833f86930ea7905daef9494

@kristipark: 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..!!

As this is a recent regression adding release blocker label for this issue.Please reduce priority or remove if not the case.

Thank You!

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/cd12c8a704dbbbf0451479246a904a013f34ffe7

commit cd12c8a704dbbbf0451479246a904a013f34ffe7
Author: kristipark <kristipark@chromium.org>
Date: Tue Aug 07 22:36:08 2018

[NTP] Fix delete tile and tile accessibility issues

Fixed tile deletion functionality. The id of the tile was not being
obtained correctly.

Also fixed various accessibility issues:
- Keyboard focus will start on the first input field of the edit
  dialog.
- The iframes now have titles instead of "frame 0".
- The "x" button on a tile will no longer remain visible after clicking
  and releasing with a mouse.
- The button labels for screen readers are now applied correctly.
- "Restore all" is now "Restore default shortcuts" in the shortcut
  removed notification.
- If custom links is enabled, pressing "backspace" or "delete" while
  the shortcut is focused will now delete the shortcut.

Also adjusted variable names to match their CSS name.

Bug:  871663 , 864357
Change-Id: I10135be42d9525931077daf0b7c859c60dd59e89
Reviewed-on: https://chromium-review.googlesource.com/1166028
Reviewed-by: Mathieu Perreault <mathp@chromium.org>
Commit-Queue: Kristi Park <kristipark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#581374}
[modify] https://crrev.com/cd12c8a704dbbbf0451479246a904a013f34ffe7/chrome/browser/resources/local_ntp/custom_links_edit.css
[modify] https://crrev.com/cd12c8a704dbbbf0451479246a904a013f34ffe7/chrome/browser/resources/local_ntp/custom_links_edit.js
[modify] https://crrev.com/cd12c8a704dbbbf0451479246a904a013f34ffe7/chrome/browser/resources/local_ntp/local_ntp.css
[modify] https://crrev.com/cd12c8a704dbbbf0451479246a904a013f34ffe7/chrome/browser/resources/local_ntp/local_ntp.js
[modify] https://crrev.com/cd12c8a704dbbbf0451479246a904a013f34ffe7/chrome/browser/resources/local_ntp/most_visited_single.css
[modify] https://crrev.com/cd12c8a704dbbbf0451479246a904a013f34ffe7/chrome/browser/resources/local_ntp/most_visited_single.js

Update:
Rechecked the above issue on Win(7,8,8.1,10), Mac(10.12.6 , 10.13.1 , 10.13.6, 10.14) and Linux(14.04) machines using latest canary build #70.0.3516.0 and issue is fixed. Hence adding TE-Verified labels.

Please refer below attached screen-cast for reference.

Thank You.

Deleted: Fixed_Result.mp4 561 KB

	Fixed_Result.mp4 561 KB View Download

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/4f929d60c62034874c772acd45f621993c9ee3e8

commit 4f929d60c62034874c772acd45f621993c9ee3e8
Author: kristipark <kristipark@chromium.org>
Date: Wed Aug 08 17:20:12 2018

[Merge M69] [NTP] Fix delete tile and tile accessibility issues

Fixed tile deletion functionality. The id of the tile was not being
obtained correctly.

Also fixed various accessibility issues:
- Keyboard focus will start on the first input field of the edit
  dialog.
- The iframes now have titles instead of "frame 0".
- The "x" button on a tile will no longer remain visible after clicking
  and releasing with a mouse.
- The button labels for screen readers are now applied correctly.
- "Restore all" is now "Restore default shortcuts" in the shortcut
  removed notification.
- If custom links is enabled, pressing "backspace" or "delete" while
  the shortcut is focused will now delete the shortcut.

Also adjusted variable names to match their CSS name.

Bug:  871663 , 864357
Change-Id: I10135be42d9525931077daf0b7c859c60dd59e89
Reviewed-on: https://chromium-review.googlesource.com/1166028
Reviewed-by: Mathieu Perreault <mathp@chromium.org>
Commit-Queue: Kristi Park <kristipark@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#581374}(cherry picked from commit cd12c8a704dbbbf0451479246a904a013f34ffe7)
Reviewed-on: https://chromium-review.googlesource.com/1167625
Reviewed-by: Kristi Park <kristipark@chromium.org>
Cr-Commit-Position: refs/branch-heads/3497@{#501}
Cr-Branched-From: 271eaf50594eb818c9295dc78d364aea18c82ea8-refs/heads/master@{#576753}
[modify] https://crrev.com/4f929d60c62034874c772acd45f621993c9ee3e8/chrome/browser/resources/local_ntp/custom_links_edit.css
[modify] https://crrev.com/4f929d60c62034874c772acd45f621993c9ee3e8/chrome/browser/resources/local_ntp/custom_links_edit.js
[modify] https://crrev.com/4f929d60c62034874c772acd45f621993c9ee3e8/chrome/browser/resources/local_ntp/local_ntp.css
[modify] https://crrev.com/4f929d60c62034874c772acd45f621993c9ee3e8/chrome/browser/resources/local_ntp/local_ntp.js
[modify] https://crrev.com/4f929d60c62034874c772acd45f621993c9ee3e8/chrome/browser/resources/local_ntp/most_visited_single.css
[modify] https://crrev.com/4f929d60c62034874c772acd45f621993c9ee3e8/chrome/browser/resources/local_ntp/most_visited_single.js

Revision 4f929d60c62034874c772acd45f621993c9ee3e8 was merged to refs/branch-heads/3497 branch with no merge approval from a TPM! 

Please explain why this change was merged to the branch!
 

This was given merge approval in https://crbug/864357

Right! Sorry for the noise!

No problem, apologies for the confusion

Update:
Rechecked the above issue on Win(7,8,8.1,10), Mac(10.12.6 , 10.13.1 , 10.13.6, 10.14) and Linux(14.04) machines using latest canary build #69.0.3497.32 and issue is fixed. Hence adding TE-Verified labels.

Please refer below attached screen-cast for reference.

Thank You.

Deleted: Fixed_Result.mp4 695 KB

	Fixed_Result.mp4 695 KB View Download