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Currently when the script reads multiple results it outputs the
last value read as well as a zero placehold for standard deviation.

According to benjhayden@ we can return all results in an array.
This change does just that and adds a test. It also updates the
expected unit test output.

Bug: 900677
Change-Id: Icc38808ea83caddbdf6b8582e2ddc34db4f8cdf0
Reviewed-on: https://chromium-review.googlesource.com/c/1338468Reviewed-by: Ned Nguyen <nednguyen@google.com>
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608882}