Using the per-revision bisect providing the bisect results,
Good build: 55.0.2876.0 (Revision:421986)
Bad build: 55.0.2878.0 (Revision:422326)

You are probably looking for a change made after 422201 (known good), but no later than 422202 (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/6403abd0235a72f80ddfd588b3e9bfe4918e497c..20166be8458e48f27382ef6d4fd0679cfccf9361

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

@skobes - 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/2349943002

Thanks!

This bug is not correlated with scroll anchoring (repros with scroll anchoring disabled in about:flags), so it is not related to the change mentioned in #1.

I am not sure it is a regression either, as I can repro in stable (54.0.2840.99), though not consistently.

Assuming the "About chrome" link is triggering a client-side navigation I would expect the MD Settings javascript to reset the scroll position.

@dbeam can you take a look or reroute as appropriate?  Feel free to kick it back to me if you think Blink scrolling code is doing the wrong thing here.

Just to to update the latest behavior of the bug, Issue is still observed on windows 10 chrome latest canaray M57-57.0.2938.0

dbeam@ Could you please let us know is there any recent update available on this issue?

Thanks!

Just to update the latest behavior of the bug, Issue is still observed on chrome latest Dev M57-57.0.2944.0
dbeam@ Could you please let us know is there any recent update available on this issue?

Thanks!

This occurs regardless of zoom level. Repro:
1) Change browser height so that About page scrolls
2) Go to chrome://md-settings and scroll partially
3) Change to About page via sidenav

Seems like we just aren't resetting scroll when switching to the About page.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/52d38e7a5ae31b750d87205b072a324cf99926ef

commit 52d38e7a5ae31b750d87205b072a324cf99926ef
Author: tommycli <tommycli@chromium.org>
Date: Wed Jan 18 01:03:36 2017

MD Settings: Scroll to top when navigating to About page.

BUG= 667671 
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation

Review-Url: https://codereview.chromium.org/2627403003
Cr-Commit-Position: refs/heads/master@{#444217}

[modify] https://crrev.com/52d38e7a5ae31b750d87205b072a324cf99926ef/chrome/browser/resources/settings/settings_page/main_page_behavior.js
[modify] https://crrev.com/52d38e7a5ae31b750d87205b072a324cf99926ef/chrome/test/data/webui/settings/basic_page_browsertest.js

Verified on Chrome OS 9202.1.0, 57.0.2987.6