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Using the per-revision bisect providing the bisect results,
Good build: 56.0.2908.0 (Revision : 429486).
Bad build:56.0.2910.0 (Revision : 430103).

You are probably looking for a change made after 429737 (known good), but no later than 429738 (first known bad).

CHANGELOG URL:

The script might not always return single CL as suspectas some perf builds might get missing due to failure.

 https://chromium.googlesource.com/chromium/src/+log/57c0a6fdc6a530bcb43f6657a8cf708752adca66..eac477641ec5fdf9e3b9ec52d46fc3a908e8503e

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

@wangxianzhu- 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/2464053003

Note : Issue is a regression issue broken in M56 and seen in latest stable , beta ,dev and canary channels and across Mac , linux and windows OS

Thanks!

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/7d8aac7b2e42174063748f68741f2a681df2e7b9

commit 7d8aac7b2e42174063748f68741f2a681df2e7b9
Author: wangxianzhu <wangxianzhu@chromium.org>
Date: Fri Apr 21 20:56:21 2017

Fix box-shadow painting for fieldset with legend, background, and border-radius

This regressed since https://codereview.chromium.org/2464053003
which separated box-shadow painting from background painting, but
missed modification to FieldsetPainter about box-shadow/background
painting.

BUG= 713331 
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2

Review-Url: https://codereview.chromium.org/2836673002
Cr-Commit-Position: refs/heads/master@{#466441}

[add] https://crrev.com/7d8aac7b2e42174063748f68741f2a681df2e7b9/third_party/WebKit/LayoutTests/paint/background/fieldset-legend-background-shadow-border-radius-expected.png
[add] https://crrev.com/7d8aac7b2e42174063748f68741f2a681df2e7b9/third_party/WebKit/LayoutTests/paint/background/fieldset-legend-background-shadow-border-radius-expected.txt
[add] https://crrev.com/7d8aac7b2e42174063748f68741f2a681df2e7b9/third_party/WebKit/LayoutTests/paint/background/fieldset-legend-background-shadow-border-radius.html
[modify] https://crrev.com/7d8aac7b2e42174063748f68741f2a681df2e7b9/third_party/WebKit/Source/core/paint/FieldsetPainter.cpp

It will be good if M59 has the fix.

Your change meets the bar and is auto-approved for M59. Please go ahead and merge the CL to branch 3071 manually. Please contact milestone owner if you have questions.
Owners: amineer@(Android), cmasso@(iOS), gkihumba@(ChromeOS), Abdul Syed@(Desktop)

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

Please merge your change to M59 branch #3071 latest before 4:00 PM PT, Monday (04/24) so we can take it for next week last M59 dev release. Thank you.

Merged: https://codereview.chromium.org/2834583005/. bugdroid email delayed.

Verified this issue on Windows-10, Mac 10.12.4 and Ubuntu 14.04 using chrome latest Dev #59.0.3071.25 by following steps mentioned in the original comment

Shadow is seen now for middle field set box. Please find the screen cast

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

If all merges have been completed, please remove any remaining Merge-Approved labels from this issue.

Thanks for your time! To disable nags, add the Disable-Nags label.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot