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Log links opened from the Most Visited iframe (shortcuts) in
MostVisited_Clicked. Log links open from elsewhere on the local NTP
in NTP_LinkOpenedFromContextMenu.

Bug: 951892, 961477
Change-Id: I961963c3f97d830dbe4ed3e6eaeb1459337bc3af
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1640608
Commit-Queue: Kyle Milka <kmilka@chromium.org>
Reviewed-by: Mark Pearson <mpearson@chromium.org>
Reviewed-by: Kristi Park <kristipark@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#668530}