Create Ukm ReportingService implementation.

components/ukm/ukm_reporting_service.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.
+
+// This file defines a service that sends ukm logs to a server.
+
+#ifndef COMPONENTS_UKM_UKM_REPORTING_SERVICE_H_
+#define COMPONENTS_UKM_UKM_REPORTING_SERVICE_H_
+
+#include <stdint.h>
+
+#include <string>
+
+#include "base/macros.h"
+#include "components/metrics/persisted_logs.h"
+#include "components/metrics/reporting_service.h"
+
+class PrefService;
+class PrefRegistrySimple;
+
+namespace metrics {
+class MetricsServiceClient;
+}
+
+namespace ukm {
+
+// A service that uploads logs to the UKM server.
+class UkmReportingService : public metrics::ReportingService {
+ public:
+  // Creates the UkmReportingService with the given |client|, and
+  // |local_state|.  Does not take ownership of the paramaters; instead stores
+  // a weak pointer to each. Caller should ensure that the parameters are valid
+  // for the lifetime of this class.
+  UkmReportingService(metrics::MetricsServiceClient* client,
+                      PrefService* local_state);
+  ~UkmReportingService() override;
+
+  // At startup, prefs needs to be called with a list of all the pref names and
+  // types we'll be using.
+  static void RegisterPrefs(PrefRegistrySimple* registry);
+
+  metrics::PersistedLogs* ukm_log_store() { return &persisted_logs_; }
+  const metrics::PersistedLogs* ukm_log_store() const {
+    return &persisted_logs_;
+  }
+
+ private:
+  // metrics:ReportingService:
+  metrics::LogStore* log_store() override;
+  std::string GetUploadUrl() const override;
+  base::StringPiece upload_mime_type() const override;
+  metrics::MetricsLogUploader::MetricServiceType service_type() const override;
+  void LogCellularConstraint(bool upload_canceled) override;
+  void LogResponseCode(int response_code) override;
+  void LogSuccess(size_t log_size) override;
+  void LogLargeRejection(size_t log_size) override;
+
+  metrics::PersistedLogs persisted_logs_;
+
+  DISALLOW_COPY_AND_ASSIGN(UkmReportingService);
+};
+
+}  // namespace ukm
+
+#endif  // COMPONENTS_UKM_UKM_REPORTING_SERVICE_H_