The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/dfa1328015f5ad0c8a79ac49073e6f9922cbd56b

commit dfa1328015f5ad0c8a79ac49073e6f9922cbd56b
Author: Yuki Awano <yawano@chromium.org>
Date: Thu Jan 10 08:16:34 2019

Enable ChromeVox developer options by default

  options UI are shown by default.

Bug: 914203
Test: Open ChromeVox options page and confirm that ChromeVox developer
Change-Id: I09ebc897cc985523a4c73ce05132b09e755c8cd5
Reviewed-on: https://chromium-review.googlesource.com/c/1399692
Reviewed-by: David Tseng <dtseng@chromium.org>
Commit-Queue: Yuki Awano <yawano@chromium.org>
Cr-Commit-Position: refs/heads/master@{#621499}
[modify] https://crrev.com/dfa1328015f5ad0c8a79ac49073e6f9922cbd56b/chrome/browser/about_flags.cc
[modify] https://crrev.com/dfa1328015f5ad0c8a79ac49073e6f9922cbd56b/chrome/browser/flag_descriptions.cc
[modify] https://crrev.com/dfa1328015f5ad0c8a79ac49073e6f9922cbd56b/chrome/browser/flag_descriptions.h
[modify] https://crrev.com/dfa1328015f5ad0c8a79ac49073e6f9922cbd56b/chrome/browser/resources/chromeos/chromevox/chromevox/background/options.js
[modify] https://crrev.com/dfa1328015f5ad0c8a79ac49073e6f9922cbd56b/chrome/browser/resources/chromeos/chromevox/cvox2/background/command_handler.js
[modify] https://crrev.com/dfa1328015f5ad0c8a79ac49073e6f9922cbd56b/chromeos/constants/chromeos_switches.cc
[modify] https://crrev.com/dfa1328015f5ad0c8a79ac49073e6f9922cbd56b/chromeos/constants/chromeos_switches.h