Add FMP to DataReductionProxy UMA and to Pingback Metrics

chrome/browser/page_load_metrics/observers/data_reduction_proxy_metrics_observer.h

Index: chrome/browser/page_load_metrics/observers/data_reduction_proxy_metrics_observer.h
diff --git a/chrome/browser/page_load_metrics/observers/data_reduction_proxy_metrics_observer.h b/chrome/browser/page_load_metrics/observers/data_reduction_proxy_metrics_observer.h
index 24780c8e94ad505d0be230f6bd8d6a48f4200e1b..7cc8f6023e78ec8d5a9b8419b2d387b0027b5c1d 100644
--- a/chrome/browser/page_load_metrics/observers/data_reduction_proxy_metrics_observer.h
+++ b/chrome/browser/page_load_metrics/observers/data_reduction_proxy_metrics_observer.h
@@ -26,20 +26,21 @@ class DataReductionProxyPingbackClient;
 
 namespace internal {
 
 // Various UMA histogram names for DataReductionProxy core page load metrics.
 extern const char kHistogramDataReductionProxyPrefix[];
 extern const char kHistogramDataReductionProxyLoFiOnPrefix[];
 extern const char kHistogramDOMContentLoadedEventFiredSuffix[];
 extern const char kHistogramFirstLayoutSuffix[];
 extern const char kHistogramLoadEventFiredSuffix[];
 extern const char kHistogramFirstContentfulPaintSuffix[];
+extern const char kHistogramFirstMeaningfulPaintSuffix[];
 extern const char kHistogramFirstImagePaintSuffix[];
 extern const char kHistogramFirstPaintSuffix[];
 extern const char kHistogramFirstTextPaintSuffix[];
 extern const char kHistogramParseStartSuffix[];
 extern const char kHistogramParseBlockedOnScriptLoadSuffix[];
 extern const char kHistogramParseDurationSuffix[];
 
 }  // namespace internal
 
 // Observer responsible for recording core page load metrics releveant to
@@ -66,20 +67,23 @@ class DataReductionProxyMetricsObserver
                     const page_load_metrics::PageLoadExtraInfo& info) override;
   void OnFirstTextPaint(
       const page_load_metrics::PageLoadTiming& timing,
       const page_load_metrics::PageLoadExtraInfo& info) override;
   void OnFirstImagePaint(
       const page_load_metrics::PageLoadTiming& timing,
       const page_load_metrics::PageLoadExtraInfo& info) override;
   void OnFirstContentfulPaint(
       const page_load_metrics::PageLoadTiming& timing,
       const page_load_metrics::PageLoadExtraInfo& info) override;
+  void OnFirstMeaningfulPaint(
+      const page_load_metrics::PageLoadTiming& timing,
+      const page_load_metrics::PageLoadExtraInfo& info) override;
   void OnParseStart(const page_load_metrics::PageLoadTiming& timing,
                     const page_load_metrics::PageLoadExtraInfo& info) override;
   void OnParseStop(const page_load_metrics::PageLoadTiming& timing,
                    const page_load_metrics::PageLoadExtraInfo& info) override;
 
  private:
   // Gets the default DataReductionProxyPingbackClient. Overridden in testing.
   virtual DataReductionProxyPingbackClient* GetPingbackClient() const;
 
   // Data related to this navigation.