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This CL updates the download progress UI for the Live Caption feature
to reflect the total download progress of both the SODA component
and the selected language pack component(s). The feature currently
only supports the en-US language pack which should be downloaded
along side the SODA component.

Bug: i1134807
Change-Id: Ie9d7a0b5442d5fdbc63c255f0aea713464ef3225
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2446468Reviewed-by: Abigail Klein <abigailbklein@google.com>
Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Evan Liu <evliu@google.com>
Cr-Commit-Position: refs/heads/master@{#813984}