Add missing file

third_party/benchmark.BUILD

+cc_library(
+    name = "benchmark",
+    srcs = glob(["src/*.cc"]),
+    hdrs = glob(["include/**/*.h", "src/*.h"]),
+    includes = [
+        "include", "."
+    ],
+    copts = [
+        "-DHAVE_POSIX_REGEX"
+    ],
+    linkstatic = 1,
+    visibility = [
+        "//visibility:public",
+    ],
+)