Manual bisect:
Good build: 59.0.3068.0
Bad build: 59.0.3069.0

Note: Issue is seen on Mac OS.

Deleted: Alignment_actual.jpg 87.7 KB

	Alignment_actual.jpg 87.7 KB View Download

Using the per-revision bisect providing the bisect results,
Good build:59.0.3068.0 (Revision:463474).
Bad build:59.0.3069.0 (Revision:463921).

You are probably looking for a change made after 463882 (known good), but no later than 463883 (first known bad).

CHANGE-LOG URL:
---------------
https://chromium.googlesource.com/chromium/src/+log/9393d3ecae1347c86f34274aba874adc864845f2..32ea48de49d9ad146142956362b8b2d4a6234d75

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

@dpapad: 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.

Review-Url:https://codereview.chromium.org/2814813002
Note :Able to reproduce the issue in Win 10.0,Ubuntu 14.04(59.0.3069.4) & Mac 10.12.3 and Able to reproduce in latest Canary #59.0.3069.0

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/0d4361cef2ed487f1a627ccd5a4047c8cbd899e8

commit 0d4361cef2ed487f1a627ccd5a4047c8cbd899e8
Author: dpapad <dpapad@chromium.org>
Date: Wed Apr 12 20:49:45 2017

MD Settings: Fix alignment issues after adding left/right padding to md-select.

Also restoring "visual" default width of 200px.

BUG= 710785 , 710802 
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation

Review-Url: https://codereview.chromium.org/2815113002
Cr-Commit-Position: refs/heads/master@{#464144}

[modify] https://crrev.com/0d4361cef2ed487f1a627ccd5a4047c8cbd899e8/ui/webui/resources/html/md_select_css.html