Extract the handling of the clean exit beacon from MetricsService. The extracted implementation sup…

components/metrics/metrics_service.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.
 
 // This file defines a service that collects information about the user
 // experience in order to help improve future versions of the app.
 
 #ifndef COMPONENTS_METRICS_METRICS_SERVICE_H_
 #define COMPONENTS_METRICS_METRICS_SERVICE_H_
 
 #include <map>
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/gtest_prod_util.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/scoped_vector.h"
 #include "base/memory/weak_ptr.h"
 #include "base/metrics/field_trial.h"
 #include "base/metrics/histogram_flattener.h"
 #include "base/metrics/histogram_snapshot_manager.h"
 #include "base/metrics/user_metrics.h"
 #include "base/time/time.h"
+#include "components/metrics/clean_exit_beacon.h"
 #include "components/metrics/metrics_log.h"
 #include "components/metrics/metrics_log_manager.h"
 #include "components/metrics/metrics_provider.h"
 #include "components/variations/active_field_trials.h"
 
 class MetricsServiceAccessor;
 class PrefService;
 class PrefRegistrySimple;
 
 namespace base {
@@ skipping 344 matching lines @@
 
   // Used to interact with the embedder. Weak pointer; must outlive |this|
   // instance.
   MetricsServiceClient* const client_;
 
   // Registered metrics providers.
   ScopedVector<MetricsProvider> metrics_providers_;
 
   PrefService* local_state_;
 
+  CleanExitBeacon clean_exit_beacon_;
+
   base::ActionCallback action_callback_;
 
   // Indicate whether recording and reporting are currently happening.
   // These should not be set directly, but by calling SetRecording and
   // SetReporting.
   bool recording_active_;
   bool reporting_active_;
 
   // Indicate whether test mode is enabled, where the initial log should never
   // be cut, and logs are neither persisted nor uploaded.
@@ skipping 57 matching lines @@
   FRIEND_TEST_ALL_PREFIXES(MetricsServiceTest,
                            PermutedEntropyCacheClearedWhenLowEntropyReset);
   FRIEND_TEST_ALL_PREFIXES(MetricsServiceTest, RegisterSyntheticTrial);
 
   DISALLOW_COPY_AND_ASSIGN(MetricsService);
 };
 
 }  // namespace metrics
 
 #endif  // COMPONENTS_METRICS_METRICS_SERVICE_H_