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Executes PSM determination if its switch is enabled during the initial
enrollment. Then, upon completion, it will execute hash dance.

As the whole PSM functionality is being controlled by a switch, its
possible to split its basic functionality and its tests in follow up
CLs.

Test: Will be added in a follow-up CL

Bug: chromium:1119581
Binary-Size: Increase is temporary.
Change-Id: I4473ef0617cc9f7e4594130bcefe57bab12ed7f3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2365952Reviewed-by: Roland Bock <rbock@google.com>
Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Reviewed-by: Amr Aboelkher <amraboelkher@chromium.org>
Reviewed-by: Amr Aboelkher <amraboelkher@google.com>
Reviewed-by: Pavol Marko <pmarko@chromium.org>
Commit-Queue: Amr Aboelkher <amraboelkher@google.com>
Cr-Commit-Position: refs/heads/master@{#804049}