The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/e84ef9b0ce92cf74aaad872583e1e757dfb95ad3

commit e84ef9b0ce92cf74aaad872583e1e757dfb95ad3
Author: estade <estade@chromium.org>
Date: Wed Sep 07 23:57:05 2016

Sharpen MdTextButton border for fractional scale factors.

BUG= 635611 , 635151 

Review-Url: https://codereview.chromium.org/2322653002
Cr-Commit-Position: refs/heads/master@{#417122}

[modify] https://crrev.com/e84ef9b0ce92cf74aaad872583e1e757dfb95ad3/ui/views/controls/button/md_text_button.cc
[modify] https://crrev.com/e84ef9b0ce92cf74aaad872583e1e757dfb95ad3/ui/views/controls/focusable_border.cc
[modify] https://crrev.com/e84ef9b0ce92cf74aaad872583e1e757dfb95ad3/ui/views/painter.cc

fixed, although you have to make sure to use it on a canvas that's not fractionally offset (e.g. use View::SetPaintToLayer(true))