The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/ba36bdbbbced29c4bf218766d2c86bd0ec569a9f

commit ba36bdbbbced29c4bf218766d2c86bd0ec569a9f
Author: Randy Rossi <rmrossi@chromium.org>
Date: Fri Nov 30 14:05:55 2018

Fix screen reader on chromecast not activating twice

This CL makes sure the bounds on the serialized node created
in ax_root_obj_wrapper.cc are set. Previously, this was left
as 0,0 and due to recent condition added to ui_event_generator.cc,
this was preventing auto generated LOAD_COMPLETE event from
firing on the desktop tree. (See ShouldFireEvent function).

Also removed all #if !defined(IS_CHROMECAST) as they had no
    effect anyway (the define was never set). No reason to omit
    this code for chromecast anyway.

Change-Id: Ifff95227a8b07349e5401678f9428a85b803ca01

      screen reader.  No issues detected.  Did the same on
      Chromecast smart display. Same.

Bug: 910325
Test: Manual install on Samus ChromeOS device, activated
Change-Id: Ifff95227a8b07349e5401678f9428a85b803ca01
Reviewed-on: https://chromium-review.googlesource.com/c/1355551
Reviewed-by: David Tseng <dtseng@chromium.org>
Commit-Queue: Randy Rossi <rmrossi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612636}
[modify] https://crrev.com/ba36bdbbbced29c4bf218766d2c86bd0ec569a9f/ui/views/accessibility/ax_root_obj_wrapper.cc