Add a PersistentStore to FeatureEngagementTracker

components/feature_engagement_tracker/internal/test/event_util.h

Index: components/feature_engagement_tracker/internal/test/event_util.h
diff --git a/components/feature_engagement_tracker/internal/test/event_util.h b/components/feature_engagement_tracker/internal/test/event_util.h
new file mode 100644
index 0000000000000000000000000000000000000000..872f68a0ce844c2e334ae4cf88a172fa0adb2ea8
--- /dev/null
+++ b/components/feature_engagement_tracker/internal/test/event_util.h
@@ -0,0 +1,26 @@
+// 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_FEATURE_ENGAGEMENT_TRACKER_INTERNAL_TEST_EVENT_UTIL_H_
+#define COMPONENTS_FEATURE_ENGAGEMENT_TRACKER_INTERNAL_TEST_EVENT_UTIL_H_
+
+#include "components/feature_engagement_tracker/internal/proto/event.pb.h"

[nyquist, 2017/05/11 17:08:03]

Nit: Could you forward declare Event instead?

[David Trainor- moved to gerrit, 2017/05/11 19:30:28]

Done.

+
+namespace feature_engagement_tracker {
+namespace test {
+
+// Adds an Event count entry for |event|.
+void SetEventCountForDay(Event* event, uint32_t day, uint32_t count);

[nyquist, 2017/05/11 17:08:03]

Nit: Missing #include "<stdint.h>"

[David Trainor- moved to gerrit, 2017/05/11 19:30:28]

Done.

+
+// Verifies that the given |event| contains a |day| with the correct |count|,
+// and that the day only exists a single time.
+void VerifyEventCount(const Event* event, uint32_t day, uint32_t count);
+
+// Verifies that the event |a| and |b| contain the exact same data.
+void VerifyEventsEqual(const Event* a, const Event* b);
+
+}  // namespace test
+}  // namespace feature_engagement_tracker
+
+#endif  // COMPONENTS_FEATURE_ENGAGEMENT_TRACKER_INTERNAL_TEST_EVENT_UTIL_H_