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Part of the set up for the metrics changes to OS Settings. Creates a
wrapper class for the existing User Action Tracker so that it can
stay alive outside of user sessions.

Bug: 1133553
Change-Id: I9f3db611f893dcfc78638c007b27b1099f63f3da
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2439021
Commit-Queue: Daniel Classon <dclasson@google.com>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812367}