Removed or extended FileMetricsProvider metrics.

Timing metrics were removed as they're consistently very small.
Result metrics were extended as they're can reflect sudden changes in
the underlying operations.

Bug: 975059
Change-Id: Ic982ad8d5e1fdcf48d5a1600adcda95bfae4f3a7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1664515
Commit-Queue: Alexei Svitkine <asvitkine@chromium.org>
Auto-Submit: Brian White <bcwhite@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#670421}
2 files changed