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Report two new disk statistics: I/O and discard time.

Bug: chromium:1067670
Change-Id: I98234cb745501574f758842d3939c147cdfd610b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2242199
Commit-Queue: Paul Moy <pmoy@chromium.org>
Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Reviewed-by: Jorge Lucangeli Obes <jorgelo@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#780371}