UKM: Added support for navigation sources

components/ukm/test_ukm_service.cc

Index: components/ukm/test_ukm_service.cc
diff --git a/components/ukm/test_ukm_service.cc b/components/ukm/test_ukm_service.cc
new file mode 100644
index 0000000000000000000000000000000000000000..5b72405610ee08793399b7ed82e473a22055499b
--- /dev/null
+++ b/components/ukm/test_ukm_service.cc
@@ -0,0 +1,30 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "components/ukm/test_ukm_service.h"
+
+namespace ukm {
+
+UkmServiceTestingHarness::UkmServiceTestingHarness() {
+  UkmService::RegisterPrefs(test_prefs_.registry());
+  test_prefs_.ClearPref(prefs::kUkmClientId);
+  test_prefs_.ClearPref(prefs::kUkmPersistedLogs);
+
+  test_ukm_service_ = base::MakeUnique<TestUkmService>(&test_prefs_);
+}
+
+UkmServiceTestingHarness::~UkmServiceTestingHarness() = default;
+
+TestUkmService::TestUkmService(PrefService* prefs_service)
+    : UkmService(prefs_service, &test_metrics_service_client_) {
+  DisableReporting();
+}
+
+TestUkmService::~TestUkmService() = default;
+
+const UkmSource* TestUkmService::GetSource(size_t source_num) const {
+  return sources_for_testing()[source_num].get();
+}
+
+}  // namespace ukm