The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/ee437463f4b30a179283fcdafb4753f0b94dc019

commit ee437463f4b30a179283fcdafb4753f0b94dc019
Author: Katie D <katie@chromium.org>
Date: Fri Jul 27 16:40:19 2018

Add system voice as default Select-to-Speak voice option.

The system voice is chosen using the Text-to-Speech settings page
and depends on locale.

Bug:  866550 
Change-Id: I249a023d9f018ef8ef1f242f82cf3c9d5b6d788b
Reviewed-on: https://chromium-review.googlesource.com/1150773
Reviewed-by: David Tseng <dtseng@chromium.org>
Commit-Queue: Katie Dektar <katie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#578668}
[modify] https://crrev.com/ee437463f4b30a179283fcdafb4753f0b94dc019/chrome/browser/resources/chromeos/select_to_speak/BUILD.gn
[modify] https://crrev.com/ee437463f4b30a179283fcdafb4753f0b94dc019/chrome/browser/resources/chromeos/select_to_speak/options.html
[modify] https://crrev.com/ee437463f4b30a179283fcdafb4753f0b94dc019/chrome/browser/resources/chromeos/select_to_speak/prefs_manager.js
[modify] https://crrev.com/ee437463f4b30a179283fcdafb4753f0b94dc019/chrome/browser/resources/chromeos/select_to_speak/select_to_speak_options.js
[modify] https://crrev.com/ee437463f4b30a179283fcdafb4753f0b94dc019/chrome/browser/resources/chromeos/select_to_speak/strings/select_to_speak_strings.grd

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/416bfc50110511b8cdedeb20f1faee4e2ddf8ab1

commit 416bfc50110511b8cdedeb20f1faee4e2ddf8ab1
Author: Katie D <katie@chromium.org>
Date: Wed Aug 01 23:04:31 2018

Select-to-Speak uses global Text-to-Speech settings for rate and pitch.

Deprecates obsolete histograms.
Adds integration tests for the data migration.

BUG= 866550 

Change-Id: I6fbce5a8725584aa0c550d28449b1c5a9d7a49f5
Reviewed-on: https://chromium-review.googlesource.com/1149013
Reviewed-by: Steven Holte <holte@chromium.org>
Reviewed-by: David Tseng <dtseng@chromium.org>
Commit-Queue: Katie Dektar <katie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579981}
[modify] https://crrev.com/416bfc50110511b8cdedeb20f1faee4e2ddf8ab1/chrome/browser/resources/chromeos/select_to_speak/BUILD.gn
[modify] https://crrev.com/416bfc50110511b8cdedeb20f1faee4e2ddf8ab1/chrome/browser/resources/chromeos/select_to_speak/manifest.json.jinja2
[modify] https://crrev.com/416bfc50110511b8cdedeb20f1faee4e2ddf8ab1/chrome/browser/resources/chromeos/select_to_speak/metrics_utils.js
[add] https://crrev.com/416bfc50110511b8cdedeb20f1faee4e2ddf8ab1/chrome/browser/resources/chromeos/select_to_speak/mock_notifications.js
[add] https://crrev.com/416bfc50110511b8cdedeb20f1faee4e2ddf8ab1/chrome/browser/resources/chromeos/select_to_speak/mock_storage.js
[modify] https://crrev.com/416bfc50110511b8cdedeb20f1faee4e2ddf8ab1/chrome/browser/resources/chromeos/select_to_speak/mock_tts.js
[modify] https://crrev.com/416bfc50110511b8cdedeb20f1faee4e2ddf8ab1/chrome/browser/resources/chromeos/select_to_speak/options.css
[modify] https://crrev.com/416bfc50110511b8cdedeb20f1faee4e2ddf8ab1/chrome/browser/resources/chromeos/select_to_speak/options.html
[modify] https://crrev.com/416bfc50110511b8cdedeb20f1faee4e2ddf8ab1/chrome/browser/resources/chromeos/select_to_speak/prefs_manager.js
[add] https://crrev.com/416bfc50110511b8cdedeb20f1faee4e2ddf8ab1/chrome/browser/resources/chromeos/select_to_speak/select_to_speak-2x.svg
[modify] https://crrev.com/416bfc50110511b8cdedeb20f1faee4e2ddf8ab1/chrome/browser/resources/chromeos/select_to_speak/select_to_speak_options.js
[add] https://crrev.com/416bfc50110511b8cdedeb20f1faee4e2ddf8ab1/chrome/browser/resources/chromeos/select_to_speak/select_to_speak_prefs_test.extjs
[modify] https://crrev.com/416bfc50110511b8cdedeb20f1faee4e2ddf8ab1/chrome/browser/resources/chromeos/select_to_speak/strings/select_to_speak_strings.grd
[modify] https://crrev.com/416bfc50110511b8cdedeb20f1faee4e2ddf8ab1/tools/metrics/histograms/enums.xml
[modify] https://crrev.com/416bfc50110511b8cdedeb20f1faee4e2ddf8ab1/tools/metrics/histograms/histograms.xml