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The library is used to build the benchmarks in google/crc32c. In the
future, it will be needed for building the benchmarks in
google/leveldb and google/snappy.

Bug: 1032895
Tested: gclient sync does not create third_party/benchmark/src/ by default. crc32c_benchmarks builds and runs when benchmarks are enabled.
Change-Id: I9b0200b4cbb815f309a66104916984343cb8f9d3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1943344Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Matthew Denton <mpdenton@chromium.org>
Commit-Queue: Victor Costan <pwnall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#728134}