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Keeping track of the average write rate on the instrumented message pipe
will allow reasoning on whether there's a spurt of messages coming
through, or whether the unread quota protocol implementation is
stalling somehow.
Likewise the additional cumulative counts and the lifetime will shed
some light on the usage of the abused interfaces.

Bug: 1011441
Change-Id: I9e3d2b1fcfe2a264208108d2c7ff3cdc4dd11e22
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2013480
Commit-Queue: Sigurður Ásgeirsson <siggi@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Reviewed-by: Chris Hamilton <chrisha@chromium.org>
Cr-Commit-Position: refs/heads/master@{#734528}