Log first meaningful paint for the document.write evaluator

chrome/browser/page_load_metrics/observers/document_write_page_load_metrics_observer.h

Index: chrome/browser/page_load_metrics/observers/document_write_page_load_metrics_observer.h
diff --git a/chrome/browser/page_load_metrics/observers/document_write_page_load_metrics_observer.h b/chrome/browser/page_load_metrics/observers/document_write_page_load_metrics_observer.h
index 8cc82d0d2c133b046ff79137e3ad14d0e83fb9aa..3da49ad2830020c77a948c7176bf456c0879e23a 100644
--- a/chrome/browser/page_load_metrics/observers/document_write_page_load_metrics_observer.h
+++ b/chrome/browser/page_load_metrics/observers/document_write_page_load_metrics_observer.h
@@ -33,6 +33,10 @@ class DocumentWritePageLoadMetricsObserver
       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 OnParseStop(
       const page_load_metrics::PageLoadTiming& timing,
       const page_load_metrics::PageLoadExtraInfo& extra_info) override;
@@ -53,6 +57,10 @@ class DocumentWritePageLoadMetricsObserver
       const page_load_metrics::PageLoadTiming& timing,
       const page_load_metrics::PageLoadExtraInfo& info);
 
+  void LogDocumentWriteEvaluatorFirstMeaningfulPaint(
+      const page_load_metrics::PageLoadTiming& timing,
+      const page_load_metrics::PageLoadExtraInfo& info);
+
   void LogDocumentWriteEvaluatorParseStop(
       const page_load_metrics::PageLoadTiming& timing,
       const page_load_metrics::PageLoadExtraInfo& info);