Using the per-revision bisect providing the bisect results,
Good build:54.0.2836.0 (Revision: 413363).
Bad build: 54.0.2837. 0 (Revision: 413618).

You are probably looking for a change made after 413405 (known good), but no later than 413406 (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/bfd1b37e43efa00f282a93a2d8e4bb1bb210eccd..d0c57905368c76aba662dbda3b4e13cb9bd454bf

From the CL above, suspecting the below change 

@sashab - 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.

Review-Url: https://codereview.chromium.org/2220873002

Thanks !

This should be fixed by https://codereview.chromium.org/2492783002/. Will work on merging this into stable.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/998f4790884a34c5ac5167876a13b7cb7495a617

commit 998f4790884a34c5ac5167876a13b7cb7495a617
Author: rune <rune@opera.com>
Date: Fri Nov 11 00:50:20 2016

Skip independent inherited property propagation to pseudo elements.

UpdatePseudoElements and IndependentInherit conflict in the following
way. If we both have an independent inherit change on the actual dom
element, and we detect that we need to update the style for the pseudo
element we need to signal the inheritance propagation to the real dom
children and signal the pseudo element recalc to the pseudo element
children. If we return IndependentInherit, we lose the information
about the need for a pseudo element recalc, and if we return
UpdatePseudoElement, we lose the inheritance propagation for the actual
dom children.

We could introduce a new IndependentInheritAndUpdatePseudoElements, but
if there exists pseudo element, we would always return this constant,
so instead just force recalc on pseudo elements on IndependentInherit.

R=sashab@chromium.org
BUG= 660735 , 660089 , 657283 

Review-Url: https://codereview.chromium.org/2492783002
Cr-Commit-Position: refs/heads/master@{#431430}

[add] https://crrev.com/998f4790884a34c5ac5167876a13b7cb7495a617/third_party/WebKit/LayoutTests/fast/css/independent-inherit-update-pseudo.html
[modify] https://crrev.com/998f4790884a34c5ac5167876a13b7cb7495a617/third_party/WebKit/Source/core/dom/Element.cpp

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/9bbebf3ba3a5b8ff0a645d026a0ede213135521d

commit 9bbebf3ba3a5b8ff0a645d026a0ede213135521d
Author: Rune Lillesveen <rune@opera.com>
Date: Thu Nov 17 10:53:20 2016

Skip independent inherited property propagation to pseudo elements.

UpdatePseudoElements and IndependentInherit conflict in the following
way. If we both have an independent inherit change on the actual dom
element, and we detect that we need to update the style for the pseudo
element we need to signal the inheritance propagation to the real dom
children and signal the pseudo element recalc to the pseudo element
children. If we return IndependentInherit, we lose the information
about the need for a pseudo element recalc, and if we return
UpdatePseudoElement, we lose the inheritance propagation for the actual
dom children.

We could introduce a new IndependentInheritAndUpdatePseudoElements, but
if there exists pseudo element, we would always return this constant,
so instead just force recalc on pseudo elements on IndependentInherit.

R=sashab@chromium.org
BUG= 660735 , 660089 , 657283 

Review-Url: https://codereview.chromium.org/2492783002
Cr-Commit-Position: refs/heads/master@{#431430}
(cherry picked from commit 998f4790884a34c5ac5167876a13b7cb7495a617)

Review URL: https://codereview.chromium.org/2511073002 .

Cr-Commit-Position: refs/branch-heads/2883@{#598}
Cr-Branched-From: 614d31daee2f61b0180df403a8ad43f20b9f6dd7-refs/heads/master@{#423768}

[add] https://crrev.com/9bbebf3ba3a5b8ff0a645d026a0ede213135521d/third_party/WebKit/LayoutTests/fast/css/independent-inherit-update-pseudo.html
[modify] https://crrev.com/9bbebf3ba3a5b8ff0a645d026a0ede213135521d/third_party/WebKit/Source/core/dom/Element.cpp

Verified the fix on Windows 10 using Chrome Beta version #55.0.2883.59 as per the comment #0.

Observed that the fix is working as expected.

Attaching the screencast for reference

Hence, adding the TE-verified labels

Deleted: Issue 657283.mp4 1.2 MB

	Issue 657283.mp4 1.2 MB View Download