Reporting top cpu and memory consumers via rappor on chromeos

components/metrics/metrics_service.cc

Index: components/metrics/metrics_service.cc
diff --git a/components/metrics/metrics_service.cc b/components/metrics/metrics_service.cc
index 3537e68a31b8ef3ee92f2ff06da982f4fa557416..20d9b44c943bd6a69dd21cef525aec5747ea62c6 100644
--- a/components/metrics/metrics_service.cc
+++ b/components/metrics/metrics_service.cc
@@ -335,6 +335,10 @@ void MetricsService::Start() {
   HandleIdleSinceLastTransmission(false);
   EnableRecording();
   EnableReporting();
+
+  FOR_EACH_OBSERVER(MetricsServiceObserver,
+                    metrics_service_observer_list_,
+                    OnMetricsServiceStart());
 }
 
 void MetricsService::StartRecordingForTests() {
@@ -344,6 +348,10 @@ void MetricsService::StartRecordingForTests() {
 }
 
 void MetricsService::Stop() {
+  FOR_EACH_OBSERVER(MetricsServiceObserver,
+                    metrics_service_observer_list_,
+                    OnMetricsServiceStop());
+
   HandleIdleSinceLastTransmission(false);
   DisableReporting();
   DisableRecording();
@@ -1036,6 +1044,14 @@ void MetricsService::RemoveSyntheticTrialObserver(
   synthetic_trial_observer_list_.RemoveObserver(observer);
 }
 
+void MetricsService::AddObserver(MetricsServiceObserver* observer) {
+  metrics_service_observer_list_.AddObserver(observer);
+}
+
+void MetricsService::RemoveObserver(MetricsServiceObserver* observer) {
+  metrics_service_observer_list_.RemoveObserver(observer);
+}
+
 void MetricsService::RegisterSyntheticFieldTrial(
     const SyntheticTrialGroup& trial) {
   for (size_t i = 0; i < synthetic_trial_groups_.size(); ++i) {