Record time to first data reduction proxy request

components/data_reduction_proxy/core/browser/data_reduction_proxy_test_utils.cc

Index: components/data_reduction_proxy/core/browser/data_reduction_proxy_test_utils.cc
diff --git a/components/data_reduction_proxy/core/browser/data_reduction_proxy_test_utils.cc b/components/data_reduction_proxy/core/browser/data_reduction_proxy_test_utils.cc
index ae6e0fd8ed5e0e8c97f8c72ebfd6da03b06f8e76..a354ed66fad82af0de7392e444863fd89d0c3444 100644
--- a/components/data_reduction_proxy/core/browser/data_reduction_proxy_test_utils.cc
+++ b/components/data_reduction_proxy/core/browser/data_reduction_proxy_test_utils.cc
@@ -476,6 +476,10 @@ DataReductionProxyTestContext::Builder::Build() {
   }
   io_data->set_config_client(std::move(config_client));
 
+  io_data->set_proxy_delegate(base::WrapUnique(new DataReductionProxyDelegate(
+      io_data->config(), io_data->configurator(), io_data->event_creator(),
+      io_data->bypass_stats(), net_log.get())));
+
   std::unique_ptr<DataReductionProxyTestContext> test_context(
       new DataReductionProxyTestContext(
           task_runner, std::move(pref_service), std::move(net_log),