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This reduces the number of individual writes to the file and sets
maximum update rate of 6 writes per minute.

BUG=1013546
TEST=components_unittests:LoopbackServerTests

Change-Id: I40a51051b449dd8f88582420f78079dd2187bd58
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1940687Reviewed-by: Greg Thompson <grt@chromium.org>
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Commit-Queue: Julian Pastarmov <pastarmovj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738543}