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This change now logs the rest of the notification UKM fields that were
previously not logged. How they are logged is unchanged.

Bug: 842622
Change-Id: Id4deab3a09dc6ff19ecdde076460b3927358b622
Reviewed-on: https://chromium-review.googlesource.com/1151116
Commit-Queue: Sharon Yang <yangsharon@google.com>
Reviewed-by: Anita Woodruff <awdf@chromium.org>
Reviewed-by: Peter Beverloo <peter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579750}