Dashboard - Distinguish between improvements and regressions when sorting alerts.
Dashboard - Distinguish between improvements and regressions when sorting alerts.

For the purposes of sorting, regressions are treated like negative numbers.

Demo: https://dev-simonhatch-ea587ba9-dot-chromeperf.appspot.com/alerts

BUG=catapult:#3201

Review-Url: https://codereview.chromium.org/2682203004

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