Delivering the FIRST_NONEMPTY_PAINT phase changing event to base/

components/metrics/profiler/tracking_synchronizer.cc

Index: components/metrics/profiler/tracking_synchronizer.cc
diff --git a/components/metrics/profiler/tracking_synchronizer.cc b/components/metrics/profiler/tracking_synchronizer.cc
index 7f76704f0753cdd9bf77472d6e23442ad64e3470..d4889ce5fd31b6881283d0a8ad9b93754a205228 100644
--- a/components/metrics/profiler/tracking_synchronizer.cc
+++ b/components/metrics/profiler/tracking_synchronizer.cc
@@ -218,6 +218,20 @@ void TrackingSynchronizer::FetchProfilerDataAsynchronously(
       base::TimeDelta::FromMinutes(1));
 }
 
+// static
+void TrackingSynchronizer::OnProfilingPhaseCompletion(
+    ProfilerEventProto::ProfilerEvent profiling_event) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+
+  if (!g_tracking_synchronizer) {
+    // System teardown is happening.
+    return;
+  }
+
+  g_tracking_synchronizer->NotifyAllProcessesOfProfilingPhaseCompletion(
+      profiling_event);
+}
+
 void TrackingSynchronizer::OnPendingProcesses(int sequence_number,
                                               int pending_processes,
                                               bool end) {
@@ -252,18 +266,51 @@ int TrackingSynchronizer::RegisterAndNotifyAllProcesses(
   // Increment pending process count for sending browser's profiler data.
   request->IncrementProcessesPending();
 
+  int current_profiling_phase = phase_completion_events_sequence_.size();
+
   // Get profiler data from renderer and browser child processes.
-  content::ProfilerController::GetInstance()->GetProfilerData(sequence_number);
+  content::ProfilerController::GetInstance()->GetProfilerData(
+      sequence_number, current_profiling_phase);
 
   // Send process data snapshot from browser process.
   tracked_objects::ProcessDataSnapshot process_data_snapshot;
-  tracked_objects::ThreadData::Snapshot(&process_data_snapshot);
+  tracked_objects::ThreadData::Snapshot(current_profiling_phase,
+                                        &process_data_snapshot);
+
   DecrementPendingProcessesAndSendData(sequence_number, process_data_snapshot,
                                        content::PROCESS_TYPE_BROWSER);
 
   return sequence_number;
 }
 
+void TrackingSynchronizer::RegisterPhaseCompletion(
+    ProfilerEventProto::ProfilerEvent profiling_event,
+    const base::TimeTicks& now) {
+  phase_completion_events_sequence_.push_back(profiling_event);
+  phase_start_times_.push_back(now);
+}
+
+void TrackingSynchronizer::NotifyAllProcessesOfProfilingPhaseCompletion(
+    ProfilerEventProto::ProfilerEvent profiling_event) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+
+  if (variations::GetVariationParamValue("UMALogUploadInterval",
+                                         "send_split_profiles") != "true") {
+    return;
+  }
+
+  int profiling_phase = phase_completion_events_sequence_.size();
+
+  RegisterPhaseCompletion(profiling_event, base::TimeTicks::Now());
+
+  // Notify renderer and browser child processes.
+  content::ProfilerController::GetInstance()->OnProfilingPhaseCompletion(
+      profiling_phase);
+
+  // Notify browser process.
+  tracked_objects::ThreadData::OnProfilingPhaseCompletion(profiling_phase);
+}
+
 void TrackingSynchronizer::SendData(
     const tracked_objects::ProcessDataSnapshot& profiler_data,
     content::ProcessType process_type,