Translate --isolate-script-test-perf-output to --chartjson_result_file and pass it to the test. That way we can use Chromium's recipe code to report results to the Perf dashboard. TBR=phoglund@webrtc.org Bug: chromium:807737 Change-Id: I2d3479fe29431cc1a8faf9a73b054a5f4ec610a4 Reviewed-on: https://webrtc-review.googlesource.com/47121 Commit-Queue: Edward Lemur <ehmaldonado@webrtc.org> Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org> Cr-Commit-Position: refs/heads/master@{#21894}