The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/6fc593926726c21e5ab868d7cd778bb0a4c4f9f1

commit 6fc593926726c21e5ab868d7cd778bb0a4c4f9f1
Author: David Tseng <dtseng@chromium.org>
Date: Fri Jan 19 23:43:45 2018

Add |ttsEngine.updateVoices| api

Bug:  803888 
Change-Id: Ia818b0ac6454d52dc51bea997d0ec814ee4905e9
Reviewed-on: https://chromium-review.googlesource.com/868505
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Commit-Queue: David Tseng <dtseng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#530659}
[modify] https://crrev.com/6fc593926726c21e5ab868d7cd778bb0a4c4f9f1/chrome/browser/speech/extension_api/tts_engine_extension_api.cc
[modify] https://crrev.com/6fc593926726c21e5ab868d7cd778bb0a4c4f9f1/chrome/browser/speech/extension_api/tts_engine_extension_api.h
[modify] https://crrev.com/6fc593926726c21e5ab868d7cd778bb0a4c4f9f1/chrome/browser/speech/extension_api/tts_engine_extension_observer.cc
[modify] https://crrev.com/6fc593926726c21e5ab868d7cd778bb0a4c4f9f1/chrome/browser/speech/extension_api/tts_engine_extension_observer.h
[modify] https://crrev.com/6fc593926726c21e5ab868d7cd778bb0a4c4f9f1/chrome/browser/speech/extension_api/tts_extension_api.cc
[modify] https://crrev.com/6fc593926726c21e5ab868d7cd778bb0a4c4f9f1/chrome/browser/speech/extension_api/tts_extension_api_constants.cc
[modify] https://crrev.com/6fc593926726c21e5ab868d7cd778bb0a4c4f9f1/chrome/browser/speech/extension_api/tts_extension_api_constants.h
[modify] https://crrev.com/6fc593926726c21e5ab868d7cd778bb0a4c4f9f1/chrome/browser/speech/extension_api/tts_extension_apitest.cc
[modify] https://crrev.com/6fc593926726c21e5ab868d7cd778bb0a4c4f9f1/chrome/common/extensions/api/speech/tts_engine_manifest_handler.cc
[modify] https://crrev.com/6fc593926726c21e5ab868d7cd778bb0a4c4f9f1/chrome/common/extensions/api/speech/tts_engine_manifest_handler.h
[modify] https://crrev.com/6fc593926726c21e5ab868d7cd778bb0a4c4f9f1/chrome/common/extensions/api/tts.json
[modify] https://crrev.com/6fc593926726c21e5ab868d7cd778bb0a4c4f9f1/chrome/common/extensions/api/tts_engine.json
[modify] https://crrev.com/6fc593926726c21e5ab868d7cd778bb0a4c4f9f1/chrome/common/extensions/docs/templates/intros/ttsEngine.html
[add] https://crrev.com/6fc593926726c21e5ab868d7cd778bb0a4c4f9f1/chrome/test/data/extensions/api_test/tts_engine/update_voices_api/manifest.json
[add] https://crrev.com/6fc593926726c21e5ab868d7cd778bb0a4c4f9f1/chrome/test/data/extensions/api_test/tts_engine/update_voices_api/test.js
[modify] https://crrev.com/6fc593926726c21e5ab868d7cd778bb0a4c4f9f1/extensions/browser/extension_function_histogram_value.h
[modify] https://crrev.com/6fc593926726c21e5ab868d7cd778bb0a4c4f9f1/tools/metrics/histograms/enums.xml