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This will help in diagnosing failures that deposit error messages in the
installer's log file.

BUG=907979

Change-Id: Ib9ddf7d120ab4f29b33cce4d64f866e071dca362
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1744146
Auto-Submit: Greg Thompson <grt@chromium.org>
Reviewed-by: Julian Pastarmov <pastarmovj@chromium.org>
Commit-Queue: Greg Thompson <grt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#685153}