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Currently both of two are measured by one metric, but there is no meaning of JavaScript measurements in application test and of Speed Index in micro benchmark. This patch separate the two types of performance tests into different page_sets, and different measurements.

BUG=372759
TEST=./tools/perf/run_benchmark --browser=android-chrome-shell service_worker.service_worker
TEST=./tools/perf/run_benchmark --browser=android-chrome-shell service_worker.service_worker_micro_benchmark

Review URL: https://codereview.chromium.org/688563002

Cr-Commit-Position: refs/heads/master@{#302521}