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This patch adds a metric to track when the user attempts to add an
account to the web when they are already signed in to Chrome. This
situation is possible when all GAIA cookies are removed from the web
during a user session.

Bug: 1154244
Change-Id: I3818d6ad6fcae014d381ccaf67ab9e0a46025ff5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2566755
Commit-Queue: Nohemi Fernandez <fernandex@chromium.org>
Reviewed-by: Brian White <bcwhite@chromium.org>
Reviewed-by: Jérôme Lebel <jlebel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#833299}