Using the per-revision bisect providing the bisect results,
Good build: 62.0.3167.0 (Revision: 489500).
Bad build: 62.0.3168.0 (Revision: 489803).

You are probably looking for a change made after 489730 (known good), but no lat
er than 489731 (first known bad).

CHANGELOG 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/01e3c1935289cf4b6bfcc3bf42bd8e1e498b445f..2f925c9a0144adf5823e14217e74854df82a51e4

From the CL above, assigning the issue to the concern owner 

@aboxhall- 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.

Suspect : https://chromium.googlesource.com/chromium/src/+/2f925c9a0144adf5823e14217e74854df82a51e4

Thanks!

Adding RB Label as this is a recent Regression. Please remove if not required.
Thank You.

aboxhall@ Able to reproduce this issue on chrome latest dev #63.0.3231.0. This issue is marked as RB-Stable, could you please let us know is there any latest update available on this issue?

Thanks!

This shouldn't be a 'RB-Stable'.

The '.spectrum-dragger' (circle) element has a 'cursor: pointer' style, while the spectrum itself has a 'cursor: default' style. As you drag the dragger, the mouse pointer may get ahead of the dragger, causing the default cursor to show up.

My change may well have made this more noticeable by slowing down the position update in some cases.

However, I'm not sure of the best fix here, so I'm reassigning to pfeldman@ for advice. Please feel free to reassign it to me if there's a fix I can do.

We should set the spectrum's cursor to pointer while dragging...

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/cdd1c27807529108d2d45243fcd9d3378e857661

commit cdd1c27807529108d2d45243fcd9d3378e857661
Author: Erik Luo <luoe@chromium.org>
Date: Tue Dec 12 02:04:56 2017

DevTools: use cursor pointer while dragging color picker spectrum

The spectrum dragger circle already has cursor: pointer style, but the
user can see flickering between two cursors because the container still
has default pointer.

This CL ensures that the container has cursor: pointer while dragging,
and default pointer when hovering without dragging.

Bug:  769234 
Change-Id: I68fb7cbe5fdc0360311fb59d11c434d3aec013ec
Reviewed-on: https://chromium-review.googlesource.com/818283
Reviewed-by: Andrey Lushnikov <lushnikov@chromium.org>
Commit-Queue: Andrey Lushnikov <lushnikov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#523300}
[modify] https://crrev.com/cdd1c27807529108d2d45243fcd9d3378e857661/third_party/WebKit/Source/devtools/front_end/color_picker/Spectrum.js

Update :
Rechecked the above issue with latest canary chrome version : 65.0.3293.0 on Windows (7,8,8.1,10),Mac OS X(10.12.6) OS and the issue is not reproduced.Kindly refer attached screen cast for reference.

Deleted: Actual_video.mov 2.6 MB

Actual_video.mov 2.6 MB Download

NOTE: Linux build is not yet available, so not added TE-Verified labels.

Update :
Rechecked the above issue with latest canary chrome version : 65.0.3294.0 on Windows (7,8,8.1,10),Linux (14.04 LTS),Mac OS X(10.12.6,10.13.1) OS and the issue is not reproduced.Kindly refer attached screen cast for reference.