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This change causes results of attempts to load MHTML archives to be
logged with a UMA histogram, providing some previously missing insight into the
performance of MHTML loading.

Bug: 901025
Change-Id: If82fda621fcf8d4256edc20a0da9172d0cde2455
Reviewed-on: https://chromium-review.googlesource.com/c/1313669Reviewed-by: Philip Rogers <pdr@chromium.org>
Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Reviewed-by: Carlos Knippschild <carlosk@chromium.org>
Commit-Queue: Ian Wells <iwells@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609062}