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The Punctuation Echo Setting has three TTS verbosity levels for speaking punctuation: None, Some, and All.
Before, the user could only change the Punctuation Echo Setting with the Cycle Punctuation Command.
This change allows the user to change the Punctuation Echo Setting from the ChromeVox Options Page.

Bug: 1124445
AX-Relnotes: Add Punctuation Echo Setting to ChromeVox Options Page
Change-Id: I726e43b9dccf23fc12acd83e2430492b042d130d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2388402
Commit-Queue: Josiah Krutz <josiahk@google.com>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: Akihiro Ota <akihiroota@chromium.org>
Cr-Commit-Position: refs/heads/master@{#804485}