GitLab

This CL extends the amount of useful information a popup tracker
has, and reports it to UKM on close.

This data will additionally be useful if we add spammy popup detection
+ enforcement at run time.

Bug: 825875
Change-Id: I1366b795c500cbf58730887cf4e71c3f32b945a8
Reviewed-on: https://chromium-review.googlesource.com/c/1313508Reviewed-by: Steven Holte <holte@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Charlie Harrison <csharrison@chromium.org>
Cr-Commit-Position: refs/heads/master@{#607725}