Instrumentation to debug actions memory leak.

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 6a44e35b51e90cf0bfb41295c5bcd7ad8be92fb1..fa0bce00631df4e74fac2478a1b6fb49152230bb 100644
--- a/components/metrics/metrics_service.cc
+++ b/components/metrics/metrics_service.cc
@@ -248,6 +248,7 @@ void MetricsService::InitializeMetricsRecordingState() {
       base::Bind(&MetricsService::StartScheduledUpload,
                  self_ptr_factory_.GetWeakPtr());
 
+  UMA_HISTOGRAM_BOOLEAN("UMA.Dbg.InitiateRecording", true);
   rotation_scheduler_.reset(new MetricsRotationScheduler(
       upload_callback,
       // MetricsServiceClient outlives MetricsService, and
@@ -260,6 +261,7 @@ void MetricsService::InitializeMetricsRecordingState() {
 }
 
 void MetricsService::Start() {
+  UMA_HISTOGRAM_BOOLEAN("UMA.Dbg.MetricsService.Start", true);
   HandleIdleSinceLastTransmission(false);
   EnableRecording();
   EnableReporting();
@@ -280,6 +282,7 @@ void MetricsService::Stop() {
 void MetricsService::EnableReporting() {
   if (reporting_service_.reporting_active())
     return;
+  UMA_HISTOGRAM_BOOLEAN("UMA.Dbg.EnableReporting", true);
   reporting_service_.EnableReporting();
   StartSchedulerIfNecessary();
 }
@@ -309,6 +312,7 @@ void MetricsService::EnableRecording() {
 
   if (recording_state_ == ACTIVE)
     return;
+  UMA_HISTOGRAM_BOOLEAN("UMA.Dbg.EnableRecording", true);
   recording_state_ = ACTIVE;
 
   state_manager_->ForceClientIdCreation();
@@ -614,6 +618,7 @@ void MetricsService::NotifyOnDidCreateMetricsLog() {
 
 void MetricsService::OpenNewLog() {
   DCHECK(!log_manager_.current_log());
+  UMA_HISTOGRAM_BOOLEAN("UMA.Dbg.OpenNewLog", true);
 
   log_manager_.BeginLoggingWithLog(CreateLog(MetricsLog::ONGOING_LOG));
   NotifyOnDidCreateMetricsLog();
@@ -643,6 +648,7 @@ void MetricsService::StartInitTask() {
 void MetricsService::CloseCurrentLog() {
   if (!log_manager_.current_log())
     return;
+  UMA_HISTOGRAM_BOOLEAN("UMA.Dbg.CloseCurrentLog", true);
 
   // If a persistent allocator is in use, update its internal histograms (such
   // as how much memory is being used) before reporting.
@@ -804,6 +810,7 @@ bool MetricsService::PrepareInitialStabilityLog(
 
 void MetricsService::PrepareInitialMetricsLog() {
   DCHECK_EQ(INIT_TASK_DONE, state_);
+  UMA_HISTOGRAM_BOOLEAN("UMA.Dbg.PrepareInitialMetricsLog", true);
 
   RecordCurrentEnvironment(initial_metrics_log_.get());
   base::TimeDelta incremental_uptime;