Update google_benchmark

Rolling v8/third_party/google_benchmark/src: https://chromium.googlesource.com/external/github.com/google/benchmark/+log/0d98dba..31e7941

Add docs for `ThreadRange`. (#1318) (Dominic Hamon)
https://chromium.googlesource.com/external/github.com/google/benchmark/+/31e7941

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

Change-Id: Iffb9cb817ddef0cf1accdcb5327d4a4ef4dc548e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3384677
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DEPS

@@ -223,7 +223,7 @@ deps = {
     'condition': 'checkout_fuchsia',
   },
   'third_party/google_benchmark/src': {
-    'url': Var('chromium_url') + '/external/github.com/google/benchmark.git' + '@' + '0d98dba29d66e93259db7daa53a9327df767a415',
+    'url': Var('chromium_url') + '/external/github.com/google/benchmark.git' + '@' + '31e7941796b55fdc3c9cc649a0b8d1c55ca7b446',
   },
   'third_party/googletest/src':
     Var('chromium_url') + '/external/github.com/google/googletest.git' + '@' + '6b74da4757a549563d7c37c8fae3e704662a043b',