FirstMeaningfulPaint UMA

chrome/browser/page_load_metrics/observers/core_page_load_metrics_observer.h

Index: chrome/browser/page_load_metrics/observers/core_page_load_metrics_observer.h
diff --git a/chrome/browser/page_load_metrics/observers/core_page_load_metrics_observer.h b/chrome/browser/page_load_metrics/observers/core_page_load_metrics_observer.h
index f6f056b71b717f3d03639a3134c11c172665c658..1fa1cb0b640ee642fc3f5ee07512e6f77393f9fc 100644
--- a/chrome/browser/page_load_metrics/observers/core_page_load_metrics_observer.h
+++ b/chrome/browser/page_load_metrics/observers/core_page_load_metrics_observer.h
@@ -79,6 +79,9 @@ class CorePageLoadMetricsObserver
   void OnFirstContentfulPaint(
       const page_load_metrics::PageLoadTiming& timing,
       const page_load_metrics::PageLoadExtraInfo& extra_info) override;
+  void OnFirstMeaningfulPaint(
+      const page_load_metrics::PageLoadTiming& timing,
+      const page_load_metrics::PageLoadExtraInfo& extra_info) override;
   void OnParseStart(
       const page_load_metrics::PageLoadTiming& timing,
       const page_load_metrics::PageLoadExtraInfo& extra_info) override;
@@ -91,6 +94,8 @@ class CorePageLoadMetricsObserver
       const page_load_metrics::FailedProvisionalLoadInfo& failed_load_info,
       const page_load_metrics::PageLoadExtraInfo& extra_info) override;
 
+  void OnUserInput(const blink::WebInputEvent& event) override;
+
  private:
   void RecordTimingHistograms(const page_load_metrics::PageLoadTiming& timing,
                               const page_load_metrics::PageLoadExtraInfo& info);
@@ -99,6 +104,7 @@ class CorePageLoadMetricsObserver
 
   ui::PageTransition transition_;
   bool initiated_by_user_gesture_;
+  base::Optional<base::Time> first_user_interaction_time_;
 
   DISALLOW_COPY_AND_ASSIGN(CorePageLoadMetricsObserver);
 };