Using the per-revision bisect providing the bisect results,
Good build:57.0.2978.0 (revision : 442756)
Bad build:57.0.2979.0 (revision : 443120)
You are probably looking for a change made after 443055 (known good), but no later than 443056 (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/ff407634505cc3c6203ed2f746000b6d6eea79b6..513f1f02c5c928367006c600cd1098f6315654ca

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

@cbiesinger- 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/2624143005

Note : As this is a recent regression , marking it as RB-Stable . Please feel free to edit/remove this.

Thanks!

This will be fixed by https://codereview.chromium.org/2684463002/

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/3c12965b9c068f00290a4c4ecce1cc9d404ec20a

commit 3c12965b9c068f00290a4c4ecce1cc9d404ec20a
Author: cbiesinger <cbiesinger@chromium.org>
Date: Tue Feb 07 20:03:27 2017

[css-flexbox] Clear override sizes when we're no longer a flex item

When we change to being absolutely positioned, we need to clear the override
size so as to avoid being affected by it.

R=eae@chromium.org
BUG= 687747 , 688938 , 688253 

Review-Url: https://codereview.chromium.org/2684463002
Cr-Commit-Position: refs/heads/master@{#448709}

[add] https://crrev.com/3c12965b9c068f00290a4c4ecce1cc9d404ec20a/third_party/WebKit/LayoutTests/css3/flexbox/change-flexitem-into-abspos.html
[modify] https://crrev.com/3c12965b9c068f00290a4c4ecce1cc9d404ec20a/third_party/WebKit/Source/core/layout/LayoutBox.cpp

Once we have enough coverage on Canary and Dev channel can you please request for merge to M57(Branch : 2987)

Yes, I'm requesting merge approval in  bug 688253 .

[Auto-generated comment by a script] We noticed that this issue is targeted for M-57; it appears the fix may have landed after branch point, meaning a merge might be required. Please confirm if a merge is required here - if so add Merge-Request-57 label, otherwise remove Merge-TBD label. Thanks.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/986dbbcbd724c5fb503b26ca44bec5b68dc3a88a

commit 986dbbcbd724c5fb503b26ca44bec5b68dc3a88a
Author: Christian Biesinger <cbiesinger@chromium.org>
Date: Wed Feb 08 21:14:43 2017

[css-flexbox] Clear override sizes when we're no longer a flex item

When we change to being absolutely positioned, we need to clear the override
size so as to avoid being affected by it.

R=eae@chromium.org
BUG= 687747 , 688938 , 688253 

Review-Url: https://codereview.chromium.org/2684463002
Cr-Commit-Position: refs/heads/master@{#448709}
(cherry picked from commit 3c12965b9c068f00290a4c4ecce1cc9d404ec20a)

Review-Url: https://codereview.chromium.org/2684073004 .
Cr-Commit-Position: refs/branch-heads/2987@{#395}
Cr-Branched-From: ad51088c0e8776e8dcd963dbe752c4035ba6dab6-refs/heads/master@{#444943}

[add] https://crrev.com/986dbbcbd724c5fb503b26ca44bec5b68dc3a88a/third_party/WebKit/LayoutTests/css3/flexbox/change-flexitem-into-abspos.html
[modify] https://crrev.com/986dbbcbd724c5fb503b26ca44bec5b68dc3a88a/third_party/WebKit/Source/core/layout/LayoutBox.cpp

Verified the issue on windows 10, Mac 10.12.2 and Ubuntu 14.04 using chrome beta version #57.0.2987.54 as per comment #0

Observed that search icon did not get misplace and appeared properly as expected.

Attaching screen cast for reference.

Hence, adding the verified labels.

Thanks...!!

Deleted: 688938.mp4 9.4 MB

	688938.mp4 9.4 MB View Download