Implement UMA log throttling for cellular connections

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 <stdint.h>
 
 #include <map>
 #include <string>
 #include <vector>
 
 #include "base/gtest_prod_util.h"
 #include "base/macros.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/observer_list.h"
 #include "base/time/time.h"
 #include "build/build_config.h"
 #include "components/metrics/clean_exit_beacon.h"
+#include "components/metrics/data_use_tracker.h"
 #include "components/metrics/metrics_log.h"
 #include "components/metrics/metrics_log_manager.h"
 #include "components/metrics/metrics_provider.h"
 #include "components/metrics/net/network_metrics_provider.h"
 #include "components/variations/synthetic_trials.h"
 
 class PrefService;
 class PrefRegistrySimple;
 
 namespace base {
@@ skipping 167 matching lines @@
   // should not be called more than once.
   void CheckForClonedInstall(
       scoped_refptr<base::SingleThreadTaskRunner> task_runner);
 
   // Clears the stability metrics that are saved in local state.
   void ClearSavedStabilityMetrics();
 
   // Pushes a log that has been generated by an external component.
   void PushExternalLog(const std::string& log);
 
+  // Returns a callback to data use pref updating function which can be called
+  // from any thread, but this function should be called on UI thread.
+  UpdateUsagePrefCallbackType GetDataUseForwardingCallback();
+
  protected:
   // Exposed for testing.
   MetricsLogManager* log_manager() { return &log_manager_; }
 
  private:
   friend class MetricsServiceAccessor;
 
   // The MetricsService has a lifecycle that is stored as a state.
   // See metrics_service.cc for description of this lifecycle.
   enum State {
@@ skipping 234 matching lines @@
   // Field trial groups that map to Chrome configuration states.
   SyntheticTrialGroups synthetic_trial_groups_;
 
   // List of observers of |synthetic_trial_groups_| changes.
   base::ObserverList<variations::SyntheticTrialObserver>
       synthetic_trial_observer_list_;
 
   // Execution phase the browser is in.
   static ExecutionPhase execution_phase_;
 
-  // Reduntant marker to check that we completed our shutdown, and set the
+  // Redundant marker to check that we completed our shutdown, and set the
   // exited-cleanly bit in the prefs.
   static ShutdownCleanliness clean_shutdown_status_;
 
   FRIEND_TEST_ALL_PREFIXES(MetricsServiceTest, IsPluginProcess);
   FRIEND_TEST_ALL_PREFIXES(MetricsServiceTest,
                            PermutedEntropyCacheClearedWhenLowEntropyReset);
   FRIEND_TEST_ALL_PREFIXES(MetricsServiceTest, RegisterSyntheticTrial);
 
+  // Pointer used for obtaining data use pref updater callback on above layers.
+  scoped_ptr<DataUseTracker> data_use_tracker_;
+
   // Weak pointers factory used to post task on different threads. All weak
   // pointers managed by this factory have the same lifetime as MetricsService.
   base::WeakPtrFactory<MetricsService> self_ptr_factory_;
 
   // Weak pointers factory used for saving state. All weak pointers managed by
   // this factory are invalidated in ScheduleNextStateSave.
   base::WeakPtrFactory<MetricsService> state_saver_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(MetricsService);
 };
 
 }  // namespace metrics
 
 #endif  // COMPONENTS_METRICS_METRICS_SERVICE_H_