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Reland "Move ISpVoice instance to a worker thread"

This is a reland of b642822f

Original change's description:
> Move ISpVoice instance to a worker thread
>
> This CL is moving the speech synthesizer code to a worker thread.
>
> The TtsPlatformImpl is using an ISpVoice COM interface to perform
> text-to-speech actions. The instance was living on the UI Main
> Thread which was using STA Apartment.
>
> This CL is splitting the logic in two parts. The first part is the
> control logic which stay on the UI Thread. The second part is the
> synthesizer logic which is running on a worker thread.
>
> Bug: 869399, 1133813
> Change-Id: I8f8d939950cc39637f87d101ed362123a51e985e
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2462341
> Commit-Queue: Etienne Bergeron <etienneb@chromium.org>
> Reviewed-by: François Doray <fdoray@chromium.org>
> Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#820340}

Bug: 869399
Bug: 1133813
Change-Id: I4f1e5bb143472b2d96cf4fe55d3f74d1e5c56877
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2502948Reviewed-by: François Doray <fdoray@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Commit-Queue: Etienne Bergeron <etienneb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821450}