Chrome Version: 66.0.3355.0 (Official Build) (64-bit) Revision 31d0bb0369f909177f2ce90b439f296bcf9c90cb-refs/heads/master@{#539001} 32/64-bit.
OS: Win(7,8,8.1,10), Mac(10.12.6, 10.13.1,10.13.4).

What steps will reproduce the problem?
1. Launch Chrome and navigate to chrome://settings page.
2. Press tab key from keyboard such that focus reaches to arrow icon and observe.

Actual: Grey focus highlight seems to be chopped from right side.
Expected: Grey focus highlight should seen properly.

This is a regression issue, broken in M-66 series, below is manual regression range.

Good build: 66.0.3350.0 (Revision: 537343)
Bad build: 66.0.3352.0 (Revision: 538313)

Using the per-revision bisect providing the bisect results:

You are probably looking for a change made after 537453 (known good), but no later than 537454 (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/e282ebc6f0e5852cfc46ee688bae89a78d119270..0a9a5c311a1d3a298f952e495510bd6fe3faa2f6

Suspecting: https://chromium.googlesource.com/chromium/src/+/0a9a5c311a1d3a298f952e495510bd6fe3faa2f6

@wangxianzhu: Could you please look into the issue, pardon me if it has nothing to do with your changes and if possible please assign it to concern owner.

NOTE: This issue is not observed on Linux(14.04 LTS).

Kindly review the attached screen-cast for reference.

Thank you.
 

Deleted: Focus highlight_Screenshot.png 9.7 KB

	Focus highlight_Screenshot.png 9.7 KB View Download

Deleted: Actual behavior.mp4 270 KB

	Actual behavior.mp4 270 KB View Download

Deleted: Expected behavior.mp4 192 KB

	Expected behavior.mp4 192 KB View Download