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Enabling Switch Access can only be done from a user profile.
However, once it's enabled, it needs to be possible for a switch
access user to reboot or sign out and still control their device.

So, every time a switch access pref is changed in a signed-in
user profile, sync that same pref value to the signin profile.
That way the next time the user is on the signin screen, switch
access continues to work with their same settings.

If someone else wants to use the machine and doesn't want
switch access enabled, they can turn it off in the
quick settings.

Bug: 1108808
Change-Id: I136abcddc59f76d7b6ba9c55e2b4cb0607c4ab36
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2361662
Commit-Queue: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: Anastasia Helfinstein <anastasi@google.com>
Cr-Commit-Position: refs/heads/master@{#799357}