GitLab

ChromeOS and non-ChromeOS installations.

Introduce a new SODAInstaller which is responsible for installing
SODA (Speech On-Device API). It has a separate implementations in
ChromeOS and non-ChromeOS. The SODAInstallerImpl on ChromeOS installs
SODA with the DlcserviceClient. The SODAInstallerImpl on non-ChromeOS
installs SODA with the ComponentUpdaterService. Each sends installation
progress updates to its observers.

The SODAInstaller has a single instance, because SODA is only downloaded
once for the entire device.

The CaptionController initiates the SODA download by calling the
InstallSODA method of the SODAInstaller. It initiates language downloads
by calling InstallLanguage.

The CaptionsHandler is a SODAInstallerObserver. It sends SODA download
updates to the captions subpage WebUI in settings. Since the
SODAInstallerObserver is a common interface between the ChromeOS
and non-ChromeOS implementations, there now only needs to be one
CaptionsHandler.

More SODAInstallerObservers will be introduced in upcoming CLs.

For more information, see this design doc: https://docs.google.com/document/d/1e9ie7WequR4UafYq72-wpXwFj0-lLWMvjXZP5jXXpwU/edit#

Bug: 1055150, 1111002
Change-Id: Ia82285a1dc1440229d7912bb07ae522abde9900b
AX-Relnotes: N/A (feature not yet launched)
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2473744
Commit-Queue: Abigail Klein <abigailbklein@google.com>
Reviewed-by: Sorin Jianu <sorin@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: dpapad <dpapad@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825222}