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This CL adds a user action for the impression of the sign-in promo which
is part of the new profile creation flow.

Bug: 1126913
Change-Id: Ia10c218ea298858947dc8f41da667f801ca5055e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2610097Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Reviewed-by: Monica Basta <msalama@chromium.org>
Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Commit-Queue: David Roger <droger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#842255}