Allow MetricsReportingScheduler's histograms to be overriden.

components/metrics/metrics_reporting_scheduler.h

 // Copyright 2014 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_METRICS_METRICS_REPORTING_SCHEDULER_H_
 #define COMPONENTS_METRICS_METRICS_REPORTING_SCHEDULER_H_
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/time/time.h"
 #include "base/timer/timer.h"
 #include "components/metrics/net/network_metrics_provider.h"
 
 namespace metrics {
 
 // Scheduler task to drive a MetricsService object's uploading.
 class MetricsReportingScheduler {
  public:
   // Creates MetricsServiceScheduler object with the given |upload_callback|
   // callback to call when uploading should happen and
   // |upload_interval_callback| to determine the interval between uploads
   // in steady state.
   MetricsReportingScheduler(
       const base::Closure& upload_callback,
       const base::Callback<base::TimeDelta(void)>& upload_interval_callback);
-  ~MetricsReportingScheduler();
+  virtual ~MetricsReportingScheduler();
 
   // Starts scheduling uploads. This in a no-op if the scheduler is already
   // running, so it is safe to call more than once.
   void Start();
 
   // Stops scheduling uploads.
   void Stop();
 
   // Callback from MetricsService when the startup init task has completed.
   void InitTaskComplete();
 
   // Callback from MetricsService when a triggered upload finishes.
   void UploadFinished(bool server_is_healthy, bool more_logs_remaining);
 
   // Callback from MetricsService when a triggered upload is cancelled by the
   // MetricsService.
   void UploadCancelled();
 
   // Sets the upload interval to a specific value, exposed for unit tests.
   void SetUploadIntervalForTesting(base::TimeDelta interval);
 
+ protected:
+  enum InitSequence {
+    TIMER_FIRED_FIRST,
+    INIT_TASK_COMPLETED_FIRST,
+    INIT_SEQUENCE_ENUM_SIZE,
+  };
+
  private:
+  // Record the init sequence order histogram.
+  virtual void LogMetricsInitSequence(InitSequence sequence);
+
+  // Record the upload interval time.
+  virtual void LogActualUploadInterval(base::TimeDelta interval);
+
   // Timer callback indicating it's time for the MetricsService to upload
   // metrics.
   void TriggerUpload();
 
   // Schedules a future call to TriggerUpload if one isn't already pending.
   void ScheduleNextUpload();
 
   // Increases the upload interval each time it's called, to handle the case
   // where the server is having issues.
   void BackOffUploadInterval();
@@ skipping 30 matching lines @@
 
   // Callback function used to get the standard upload time.
   base::Callback<base::TimeDelta(void)> upload_interval_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(MetricsReportingScheduler);
 };
 
 }  // namespace metrics
 
 #endif  // COMPONENTS_METRICS_METRICS_REPORTING_SCHEDULER_H_