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See bug for more context; the Espeak extension provides
a lower-quality speech engine that supports many more
languages, enabling us to support virtually all world
languages out-of-the-box on Chrome OS without requiring
a separate download.

This new engine must be in a separate component
extension due to having a different license.

This patch puts the extension load behind a flag,
--enable-experimental-accessibility-features, because
it needs some more polish before we launch it to
all users.

Bug: 862710
TBR=michaelpg@chromium.org

Change-Id: Ia4d010fa5ff217928a3a66d17543bd4990d24c10
Reviewed-on: https://chromium-review.googlesource.com/c/1247038
Commit-Queue: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601852}