Basic UkmService implementation

components/ukm/ukm_service_unittest.cc

Index: components/ukm/ukm_service_unittest.cc
diff --git a/components/ukm/ukm_service_unittest.cc b/components/ukm/ukm_service_unittest.cc
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+// 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/ukm_service.h"
+
+#include "components/metrics/test_metrics_service_client.h"
+#include "components/prefs/testing_pref_service.h"
+#include "components/ukm/ukm_service.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace ukm {
+
+TEST(UkmServiceTest, Construct) {
+  TestingPrefServiceSimple test_prefs;
+  metrics::TestMetricsServiceClient test_client;
+  UkmService service(&test_prefs, &test_client);
+}
+
+}  // namespace ukm