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New metric - ComponentUpdater.CROS.Result: track the chrome os installer result (error code, etc.).
New metric - ComponentUpdater.CROS.MountTime: track time to mount a component image.

BUG=chromium:793052
TEST=platform_AddPrinter.epson

Change-Id: I502e1983adcacb488877e83723cc91b6ee504312
Reviewed-on: https://chromium-review.googlesource.com/963182
Commit-Queue: Xiaochu Liu <xiaochu@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Reviewed-by: Dan Erat <derat@chromium.org>
Reviewed-by: Joshua Pawlicki <waffles@chromium.org>
Reviewed-by: Sorin Jianu <sorin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#548480}