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This CL also refactors the method to generate the story set from benchmark into
tools/perf/core/benchmark_utils.py for better code sharing

Bug:874940
Cq-Include-Trybots: master.tryserver.chromium.perf:obbs_fyi
Change-Id: I2a551840fd852162a4743eac769d92c6ee499bc4

NOTRY=true  # all tests passed in patch set 3

Change-Id: I2a551840fd852162a4743eac769d92c6ee499bc4
Reviewed-on: https://chromium-review.googlesource.com/1179603
Commit-Queue: Ned Nguyen <nednguyen@google.com>
Reviewed-by: Juan Antonio Navarro Pérez <perezju@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584081}