Update google_benchmark

Rolling v8/third_party/google_benchmark/src: https://chromium.googlesource.com/external/github.com/google/benchmark/+log/7cb2914..a25f3cd

Appended additional BSD 3-Clause to LICENSE (#1363) (Vy Nguyen)
https://chromium.googlesource.com/external/github.com/google/benchmark/+/a25f3cd

Add SetBenchmarkFilter() to set --benchmark_filter flag value in user code (#1362) (Vy Nguyen)
https://chromium.googlesource.com/external/github.com/google/benchmark/+/eacce0b

Add long description and content type for proper PyPI presentation (#1361) (Nicholas Junge)
https://chromium.googlesource.com/external/github.com/google/benchmark/+/df7749c

Allow setting the default time unit globally (#1337) (Bátor Tallér)
https://chromium.googlesource.com/external/github.com/google/benchmark/+/d08e7b6

restore BENCHMARK_MAIN() (#1357) (Sergiu Deitsch)
https://chromium.googlesource.com/external/github.com/google/benchmark/+/e33986a

R=v8-waterfall-sheriff@grotations.appspotmail.com,mtv-sf-v8-sheriff@grotations.appspotmail.com,mlippautz@chromium.org

Change-Id: I6e4614ebf74b16768ee6e6534e7693022e9bac9f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3514720
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