Add FMP to DataReductionProxy UMA and to Pingback Metrics

chrome/browser/page_load_metrics/observers/data_reduction_proxy_metrics_observer.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_PAGE_LOAD_METRICS_OBSERVERS_DATA_REDUCTION_PROXY_METRICS_OBSERVER_H_
 #define CHROME_BROWSER_PAGE_LOAD_METRICS_OBSERVERS_DATA_REDUCTION_PROXY_METRICS_OBSERVER_H_
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 15 matching lines @@
 
 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
@@ skipping 20 matching lines @@
                     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.
   std::unique_ptr<DataReductionProxyData> data_;
 
   // The browser context this navigation is operating in.
   content::BrowserContext* browser_context_;
 
   DISALLOW_COPY_AND_ASSIGN(DataReductionProxyMetricsObserver);
 };
 
 }  // namespace data_reduction_proxy
 
 #endif  // CHROME_BROWSER_PAGE_LOAD_METRICS_OBSERVERS_DATA_REDUCTION_PROXY_METRICS_OBSERVER_H_