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Record for each window.open(), href link activation, and location=xxx. Those
calls should be mutually exclusive.

For this metric to be accurate, it has to assume that "the navigation was
initiated in a frame with transient gesture" == "the navigation was caused
by this gesture", which can be wrong. But it may just work in practice and
it seems to be a general assumption we have been making throughout Chrome.

Bug: 864147
Change-Id: If7f75bd8d17e1d2ea572607e6f8f4149c78222fd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1488111
Commit-Queue: Yao Xiao <yaoxia@chromium.org>
Reviewed-by: Bryan McQuade <bmcquade@chromium.org>
Reviewed-by: Camille Lamy <clamy@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Charlie Harrison <csharrison@chromium.org>
Reviewed-by: Mustaq Ahmed <mustaq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#638631}