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This CL attaches impressions to context menu navigations that occur
from anchor tags with impression attributes.

This also declares the frame the context menu occurred in as the
initiator routing frame for the navigation, which was previously null.

Bug: 1049674
Change-Id: I7a2031b41865d44bc926c87af1fba86aa72048f8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2240198
Commit-Queue: John Delaney <johnidel@chromium.org>
Reviewed-by: Ken Buchanan <kenrb@chromium.org>
Reviewed-by: Nate Chapin <japhet@chromium.org>
Reviewed-by: Charlie Harrison <csharrison@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#790625}