Create Ukm ReportingService implementation.

components/ukm/metrics_reporting_scheduler.h

-// 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_METRICS_REPORTING_SCHEDULER_H_
-#define COMPONENTS_UKM_METRICS_REPORTING_SCHEDULER_H_
-
-#include "base/time/time.h"
-#include "components/metrics/metrics_reporting_scheduler.h"
-
-namespace ukm {
-
-// Scheduler task to drive a MetricsService object's uploading.
-class MetricsReportingScheduler : public metrics::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() override;
-
- private:
-  // Record the init sequence order histogram.
-  void LogMetricsInitSequence(InitSequence sequence) override;
-
-  // Record the upload interval time.
-  void LogActualUploadInterval(base::TimeDelta interval) override;
-
-  DISALLOW_COPY_AND_ASSIGN(MetricsReportingScheduler);
-};
-
-}  // namespace ukm
-
-#endif  // COMPONENTS_UKM_METRICS_REPORTING_SCHEDULER_H_