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instance.

Extensions violate browsing instance boundaries.  The UMA metrics added
in this CL should help confirm or deny the theory that violating
browsing instance boundaries is only needed for looking up background
contents / pages (of VIEW_TYPE_BACKGROUND_CONTENTS type).

Bug: 718489
Change-Id: I69246c7d38962c85c55b2e4d271b19eaae1dae1e
Reviewed-on: https://chromium-review.googlesource.com/766469
Commit-Queue: Łukasz Anforowicz <lukasza@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#532899}