ADD: added new version of protobuf

libs/protobuf/kokoro/linux/benchmark/continuous.cfg

@@ -0,0 +1,11 @@
+# Config file for running tests in Kokoro
+
+# Location of the build script in repository
+build_file: "protobuf/kokoro/linux/benchmark/build.sh"
+timeout_mins: 240
+
+action {
+  define_artifacts {
+    regex: "**/sponge_log.xml"
+  }
+}