Basic UkmService implementation

components/metrics/test_metrics_service_client.cc

Index: components/metrics/test_metrics_service_client.cc
diff --git a/components/metrics/test_metrics_service_client.cc b/components/metrics/test_metrics_service_client.cc
index 7c7ccc68e073dcb0bf5b9cc0237b8430621d393e..491b6f673d2f28c08d80b9b936f12a02770081ca 100644
--- a/components/metrics/test_metrics_service_client.cc
+++ b/components/metrics/test_metrics_service_client.cc
@@ -66,6 +66,8 @@ void TestMetricsServiceClient::CollectFinalMetricsForLog(
 }
 
 std::unique_ptr<MetricsLogUploader> TestMetricsServiceClient::CreateUploader(
+    const std::string& server_url,
+    const std::string& mime_type,
     const base::Callback<void(int)>& on_upload_complete) {
   return std::unique_ptr<MetricsLogUploader>();
 }