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This converts the custom view tracking logic with just static/
explicit offsets.  This view no longer is under the crazy development
that made the custom tracking somewhat reasonable.  It is now just
overly complicated and more difficult to reason about.  Phone converted
to static offsets a while ago, so this unifies it with tablets.

BUG=883143

Change-Id: I6076501bee54f052a372be97aaab97686f44497b
Reviewed-on: https://chromium-review.googlesource.com/1228985
Commit-Queue: Ted Choc <tedchoc@chromium.org>
Reviewed-by: Theresa <twellington@chromium.org>
Reviewed-by: Pedro Amaral <amaralp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#592993}