Basic UkmService implementation

components/metrics/metrics_service.cc

Index: components/metrics/metrics_service.cc
diff --git a/components/metrics/metrics_service.cc b/components/metrics/metrics_service.cc
index 46da8094c0954163d22b0a496e58d1cb908c9e9b..7dfdf3a4945ad042a036418267e060485ea4728d 100644
--- a/components/metrics/metrics_service.cc
+++ b/components/metrics/metrics_service.cc
@@ -159,6 +159,7 @@
 #include "components/metrics/metrics_reporting_scheduler.h"
 #include "components/metrics/metrics_service_client.h"
 #include "components/metrics/metrics_state_manager.h"
+#include "components/metrics/url_constants.h"
 #include "components/prefs/pref_registry_simple.h"
 #include "components/prefs/pref_service.h"
 #include "components/variations/entropy_provider.h"
@@ -1009,6 +1010,8 @@ void MetricsService::SendStagedLog() {
 
   if (!log_uploader_) {
     log_uploader_ = client_->CreateUploader(
+        metrics::kDefaultMetricsServerUrl,
+        metrics::kDefaultMetricsMimeType,
         base::Bind(&MetricsService::OnLogUploadComplete,
                    self_ptr_factory_.GetWeakPtr()));
   }