Reporting top cpu and memory consumers via rappor on chromeos

components/metrics/metrics_service.h

Index: components/metrics/metrics_service.h
diff --git a/components/metrics/metrics_service.h b/components/metrics/metrics_service.h
index 5a63352092993d40899195299874790609845cd9..e411f1bc018253bbea5c21d7d1bb5bfa134f73dd 100644
--- a/components/metrics/metrics_service.h
+++ b/components/metrics/metrics_service.h
@@ -88,6 +88,16 @@ class SyntheticTrialObserver {
   virtual ~SyntheticTrialObserver() {}
 };
 
+// Interface for observing whenever the MetricsService is started or stopped.
+class MetricsServiceObserver {
+ public:
+  virtual void OnMetricsServiceStart() = 0;
+  virtual void OnMetricsServiceStop() = 0;
+
+ protected:
+  virtual ~MetricsServiceObserver() {}
+};
+
 // See metrics_service.cc for a detailed description.
 class MetricsService : public base::HistogramFlattener {
  public:
@@ -232,6 +242,11 @@ class MetricsService : public base::HistogramFlattener {
   // Removes an existing observer of synthetic trials list changes.
   void RemoveSyntheticTrialObserver(SyntheticTrialObserver* observer);
 
+  // Add / remove observers interested in watching the MetricsService start and
+  // stop events.
+  void AddObserver(MetricsServiceObserver* observer);
+  void RemoveObserver(MetricsServiceObserver* observer);
+
   // Register the specified |provider| to provide additional metrics into the
   // UMA log. Should be called during MetricsService initialization only.
   void RegisterMetricsProvider(scoped_ptr<MetricsProvider> provider);
@@ -486,6 +501,10 @@ class MetricsService : public base::HistogramFlattener {
   // List of observers of |synthetic_trial_groups_| changes.
   base::ObserverList<SyntheticTrialObserver> synthetic_trial_observer_list_;
 
+  // List of observers interested in watching the MetricsService start and stop
+  // events.
+  base::ObserverList<MetricsServiceObserver> metrics_service_observer_list_;
+
   // Execution phase the browser is in.
   static ExecutionPhase execution_phase_;