GitLab

Adding standard trace events to help investigating net::disk_cache
from the field using slow-reports.

R=morlovich@chromium.org, gab@chromium.org

Bug: 1065004
Change-Id: I0e2d2a87cc8071ae722ee163d7591d002c93caaf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2122390
Commit-Queue: Etienne Bergeron <etienneb@chromium.org>
Reviewed-by: oysteine <oysteine@chromium.org>
Reviewed-by: Gabriel Charette <gab@chromium.org>
Reviewed-by: Maksim Orlovich <morlovich@chromium.org>
Cr-Commit-Position: refs/heads/master@{#753813}