The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/b1448a03ddd9c30a6711cb485ba0614a5e41579e

commit b1448a03ddd9c30a6711cb485ba0614a5e41579e
Author: estade <estade@chromium.org>
Date: Thu Oct 20 19:52:12 2016

Harmony - Draw bubble/dialog borders just outside the content area
instead of just inside of it.

As noted in code comments, this creates minor graphical bugs at scale
factors greater than 1, but I don't think they can be addressed at the
moment.

BUG= 655589 , 656662 

Review-Url: https://chromiumcodereview.appspot.com/2439793002
Cr-Commit-Position: refs/heads/master@{#426570}

[modify] https://crrev.com/b1448a03ddd9c30a6711cb485ba0614a5e41579e/ui/views/bubble/bubble_border.cc