Update run_chromium_perf to use csv-pivot-table
Update run_chromium_perf to use csv-pivot-table

BUG=skia:3920
TBR=jcgregorio

Review URL: https://codereview.chromium.org/1169123002

google/skia-buildbot,Tiger66639/skia-buildbot,Tiger66639/skia-buildbot,Tiger66639/skia-buildbot,Tiger66639/skia-buildbot,google/skia-buildbot,Tiger66639/skia-buildbot,Tiger66639/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,Tiger66639/skia-buildbot,google/skia-buildbot