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Adding browser tests to check welcome screen -> language settings flow.
Adding browser tests to check welcome screen -> accessibility flow.
Adding browser tests to verify accessibility, language, and keyboard setup in
OOBE works properly.

Bug: 953020
Change-Id: I6184ca0fe47bc127dd0bc1b74bb9e2a5a0c8677c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1586586
Commit-Queue: Yulun Wu <yulunwu@chromium.org>
Reviewed-by: Toni Baržić <tbarzic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#656469}