time metric: record elapsed time from when the backgrounded and purged renderer is foregrounded unti

content/renderer/render_thread_impl.h

Index: content/renderer/render_thread_impl.h
diff --git a/content/renderer/render_thread_impl.h b/content/renderer/render_thread_impl.h
index 1506ecf06f0346a10c7415cde00d725604a34303..5d8c8ad52a2b5b1f0e427e9f0fb45f0f72e8a559 100644
--- a/content/renderer/render_thread_impl.h
+++ b/content/renderer/render_thread_impl.h
@@ -496,6 +496,8 @@ class CONTENT_EXPORT RenderThreadImpl
   };
   void GetRendererMemoryMetrics(RendererMemoryMetrics* memory_metrics) const;
 
+  void OnPostWidgetUpdateVisualState();
+
  protected:
   RenderThreadImpl(
       const InProcessChildThreadParams& params,
@@ -766,6 +768,8 @@ class CONTENT_EXPORT RenderThreadImpl
   base::CancelableClosure record_purge_suspend_metric_closure_;
   RendererMemoryMetrics purge_and_suspend_memory_metrics_;
   base::CancelableClosure record_purge_suspend_growth_metric_closure_;
+  bool record_first_active_paint_;
+  base::TimeTicks foregrounded_time_;
 
   int32_t client_id_;