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This change adds a nudge view that is triggered to show after copy and
pasting twice. The nudge is only shown for 6 seconds before being
automatically dismissed. The nudge should only be shown 3 times total.

Bug: 1105541
Change-Id: Ic31863e1bab23ca50a298e22848611168bd17dca
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2417978
Commit-Queue: Matthew Mourgos <mmourgos@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Alex Newcomer <newcomer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#815835}