Reland "Add tests for voice and language prefs"

This is a reland of commit eaf191b2e8d1ee194f2cc8a5f1c1cf87721a3a05

This fixes the imports to use bundled read_anything.js.

Original change's description:
> Add tests for voice and language prefs
>
> Fixed: 337910273
> Change-Id: I674a87b63e9823bdee136674da82464daaca928c
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5503425
> Auto-Submit: Kristi Saney <kristislee@google.com>
> Reviewed-by: Lauren Winston <lwinston@google.com>
> Commit-Queue: Lauren Winston <lwinston@google.com>
> Cr-Commit-Position: refs/heads/main@{#1294761}

Change-Id: Id6a6fcdff42a2ac48489befd7c8a82069bb77ace
Fixed: 337910273
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5504012
Auto-Submit: Kristi Saney <kristislee@google.com>
Reviewed-by: Lauren Winston <lwinston@google.com>
Commit-Queue: Lauren Winston <lwinston@google.com>
Cr-Commit-Position: refs/heads/main@{#1295013}