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These changes allow the new extension updater to capture more error details,
which would help investigate the significant discrepancies the update
results of the running Finch experiment.

Bug: 722942
Change-Id: I269bbadc71bf736a79e0aa95aed6d1fc78f4e288
Reviewed-on: https://chromium-review.googlesource.com/1065196Reviewed-by: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Commit-Queue: Minh Nguyen <mxnguyen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#561716}