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Add perftests to compute read + write throughput. This CL only implements
benchmarks for ThreadLocalStorage. PlatformThreadLocalStorage will be added as
a follow-up.

Change-Id: I80de0bcb3a31e771646c942413aa156ecf960798
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1643469
Commit-Queue: Etienne Pierre-Doray <etiennep@chromium.org>
Reviewed-by: François Doray <fdoray@chromium.org>
Cr-Commit-Position: refs/heads/master@{#666213}