Add benchmark for client API.

Bug: 160388760
Change-Id: Id8a36f621b3cdedf9d1494d19ead5c5392ab8259
diff --git a/gn/perfetto_benchmarks.gni b/gn/perfetto_benchmarks.gni
index ddca3f2..2bde376 100644
--- a/gn/perfetto_benchmarks.gni
+++ b/gn/perfetto_benchmarks.gni
@@ -29,3 +29,7 @@
   "test:benchmark_main",
   "test:end_to_end_benchmarks",
 ]
+
+if (enable_perfetto_heapprofd) {
+  perfetto_benchmarks_targets += [ "src/profiling/memory:benchmarks" ]
+}