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Since recording should work for all user_story, not just page.
And the logic of record_wpr should be very similar to
telemetry/benchmark_runner.py, we would want them to be a
sibling in the directory hierarchy.

BUG=470865

Review URL: https://codereview.chromium.org/1140243002

Cr-Commit-Position: refs/heads/master@{#330123}