protozero: Add ProtoZero vs protolite benchmark

Numbers will be used for docs

Change-Id: I161664352167ea01bd0620544368fdb40b9be77f
diff --git a/src/protozero/BUILD.gn b/src/protozero/BUILD.gn
index 124bb56..18f8e7e 100644
--- a/src/protozero/BUILD.gn
+++ b/src/protozero/BUILD.gn
@@ -92,3 +92,17 @@
     "../base",
   ]
 }
+
+if (enable_perfetto_benchmarks) {
+  source_set("benchmarks") {
+    testonly = true
+    deps = [
+      ":protozero",
+      ":testing_messages_lite",
+      ":testing_messages_zero",
+      "../../gn:benchmark",
+      "../../gn:default_deps",
+    ]
+    sources = [ "test/protozero_benchmark.cc" ]
+  }
+}