Add tracing benchmark
Add tracing benchmark

This CL adds benchmark for Chrome tracing system. It
includes several typical trace settings. More scenarios can
be added if needed.

Benchmark run time on local workstation (linux):
- tracing.tracing_debug_overhead with Top10PageSet: 3m33s

Design doc: https://goo.gl/VYIBqT

BUG=catapult:#2078
CQ_EXTRA_TRYBOTS=tryserver.chromium.perf:android_s5_perf_cq;tryserver.chromium.perf:winx64_10_perf_cq;tryserver.chromium.perf:mac_retina_perf_cq;tryserver.chromium.perf:linux_perf_cq

Review URL: https://codereview.chromium.org/1776583003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#381255}

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