The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/afe8f6f90d691e26d8246943b6f884c292b095e6

commit afe8f6f90d691e26d8246943b6f884c292b095e6
Author: Zach Helfinstein <zhelfins@chromium.org>
Date: Thu Sep 20 00:45:16 2018

Implement Accessibility ScrollUp, ScrollDown, etc.

Bug:  885325 
Change-Id: Ifc4253dff4334d85597fb14412248c02fcc41c2a
Reviewed-on: https://chromium-review.googlesource.com/1231896
Commit-Queue: Zach Helfinstein <zhelfins@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#592635}
[modify] https://crrev.com/afe8f6f90d691e26d8246943b6f884c292b095e6/content/browser/accessibility/accessibility_action_browsertest.cc
[modify] https://crrev.com/afe8f6f90d691e26d8246943b6f884c292b095e6/content/renderer/accessibility/render_accessibility_impl.cc
[modify] https://crrev.com/afe8f6f90d691e26d8246943b6f884c292b095e6/content/renderer/accessibility/render_accessibility_impl.h