[Background Sync] Gather UMA data for Background Sync

content/browser/background_sync/background_sync_metrics.h

+// Copyright 2015 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 CONTENT_BROWSER_BACKGROUND_SYNC_BACKGROUND_SYNC_METRICS_H_
+#define CONTENT_BROWSER_BACKGROUND_SYNC_BACKGROUND_SYNC_METRICS_H_
+
+#include "base/macros.h"
+#include "base/time/time.h"
+#include "content/browser/background_sync/background_sync.pb.h"
+
+namespace content {
+
+class BackgroundSyncMetrics {

[Alexei Svitkine (slow), 2015/07/09 21:02:57]

Add a comment explaining the purpose of this class.

[iclelland, 2015/07/10 14:57:26]

Done.

+ public:
+  enum RegistrationResult {
+    REGISTRATION_RESULT_SUCCEEDED,
+    REGISTRATION_RESULT_FAILED,
+    REGISTRATION_RESULT_DUPLICATE,
+    NUM_REGISTRATION_RESULT_TYPES
+  };
+
+  // Counts the number of times that the device was woken up for syncs.
+  // |success| indicates whether any events successfully completed.
+  static void CountWakeUpForSync(SyncPeriodicity periodicity, bool success);
+
+  // Records the time taken starting the browser process to fire a sync.
+  static void RecordWakeUpTime(const base::TimeDelta& time);
+
+  // Records the result of a single sync event firing.
+  static void RecordEventResult(SyncPeriodicity periodicity, bool result);
+
+  // Records the total time spent running all sync events.
+  static void RecordSyncEventHandlingTime(const base::TimeDelta& time);
+
+  // Records the result of trying to register a sync. |could_fire| indicates
+  // whether the network/power was sufficient for the sync to fire immediately
+  // at the time it was registered.
+  static void CountRegistration(SyncPeriodicity periodicity,
+                                bool could_fire,
+                                RegistrationResult result);
+
+  // Records the result of trying to unregister a sync.
+  static void CountUnregistration(SyncPeriodicity periodicity, bool success);
+
+ private:
+  DISALLOW_IMPLICIT_CONSTRUCTORS(BackgroundSyncMetrics);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_BACKGROUND_SYNC_BACKGROUND_SYNC_METRICS_H_