Initial UKMPageLoadMetricsObserver

components/ukm/test_ukm_service.h

Index: components/ukm/test_ukm_service.h
diff --git a/components/ukm/test_ukm_service.h b/components/ukm/test_ukm_service.h
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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.
+
+#ifndef COMPONENTS_UKM_TEST_UKM_SERVICE_H_
+#define COMPONENTS_UKM_TEST_UKM_SERVICE_H_
+
+#include <stddef.h>
+#include <memory>
+
+#include "components/metrics/test_metrics_service_client.h"
+#include "components/prefs/testing_pref_service.h"
+#include "components/ukm/ukm_pref_names.h"
+#include "components/ukm/ukm_service.h"
+
+namespace ukm {
+
+// Wraps an UkmService with additional accessors used for testing.
+class TestUkmService : public UkmService {
+ public:
+  TestUkmService(PrefService* pref_service);
+  ~TestUkmService() override;
+
+  size_t sources_count() const { return sources_for_testing().size(); }
+  const UkmSource* GetSource(size_t source_num) const;
+
+ private:
+  metrics::TestMetricsServiceClient test_metrics_service_client_;
+  DISALLOW_COPY_AND_ASSIGN(TestUkmService);
+};
+
+// Convenience harness used for testing; creates a TestUkmService and
+// supplies it with a prefs service with a longer lifespan.
+class UkmServiceTestingHarness {
+ public:
+  UkmServiceTestingHarness();
+  virtual ~UkmServiceTestingHarness();
+
+  TestUkmService* test_ukm_service() const { return test_ukm_service_.get(); }
+
+ private:
+  TestingPrefServiceSimple test_prefs_;
+  std::unique_ptr<TestUkmService> test_ukm_service_;
+};
+
+}  // namespace ukm
+
+#endif  // COMPONENTS_UKM_TEST_UKM_SERVICE_H_