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This is a reland of 0c9cf96c

Original change's description:
> oobe a11y: Add a test to verify profile switch during user login.
>
> Profile switches between signin and user during the login. Accessibility
> manager should correctly switch the profile.
>
> Also reeanbled OobeSpokenFeedbackTest on MSAN. It's already filtered out
> by chromeos.msan.browser_tests.oobe_(positive|negative).filter files.
>
> Bug: 1108996
> Change-Id: Ic586f7172e26bd965c42a9a566005fd872a69697
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2474696
> Commit-Queue: Roman Sorokin [CET] <rsorokin@chromium.org>
> Reviewed-by: David Tseng <dtseng@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#817861}

Bug: 1108996, 1139530
Change-Id: Iee0384a2293f7d62853c22201171b786f8857fa7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2485218
Auto-Submit: Roman Sorokin [CET] <rsorokin@chromium.org>
Reviewed-by: David Tseng <dtseng@chromium.org>
Commit-Queue: Roman Sorokin [CET] <rsorokin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#818885}