Make QPS server builder customizeabled
diff --git a/grpc.gyp b/grpc.gyp
index 7cbd9ed..e1485ef 100644
--- a/grpc.gyp
+++ b/grpc.gyp
@@ -1718,6 +1718,7 @@
         'test/cpp/qps/client_sync.cc',
         'test/cpp/qps/driver.cc',
         'test/cpp/qps/parse_json.cc',
+        'test/cpp/qps/qps_server_builder.cc',
         'test/cpp/qps/qps_worker.cc',
         'test/cpp/qps/report.cc',
         'test/cpp/qps/server_async.cc',