FirstMeaningfulPaint UMA

chrome/browser/page_load_metrics/page_load_metrics_observer.h

 // Copyright 2015 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_PAGE_LOAD_METRICS_OBSERVER_H_
 #define CHROME_BROWSER_PAGE_LOAD_METRICS_PAGE_LOAD_METRICS_OBSERVER_H_
 
 #include "base/macros.h"
 #include "base/optional.h"
 #include "chrome/common/page_load_metrics/page_load_timing.h"
@@ skipping 158 matching lines @@
   virtual void OnFirstLayout(const PageLoadTiming& timing,
                              const PageLoadExtraInfo& extra_info) {}
   virtual void OnFirstPaint(const PageLoadTiming& timing,
                             const PageLoadExtraInfo& extra_info) {}
   virtual void OnFirstTextPaint(const PageLoadTiming& timing,
                                 const PageLoadExtraInfo& extra_info) {}
   virtual void OnFirstImagePaint(const PageLoadTiming& timing,
                                  const PageLoadExtraInfo& extra_info) {}
   virtual void OnFirstContentfulPaint(const PageLoadTiming& timing,
                                       const PageLoadExtraInfo& extra_info) {}
+  virtual void OnFirstMeaningfulPaint(const PageLoadTiming& timing,
+                                      const PageLoadExtraInfo& extra_info) {}
   virtual void OnParseStart(const PageLoadTiming& timing,
                             const PageLoadExtraInfo& extra_info) {}
   virtual void OnParseStop(const PageLoadTiming& timing,
                            const PageLoadExtraInfo& extra_info) {}
 
   // Observer method to be invoked when there is a change in PageLoadMetadata's
   // behavior_flags.
   virtual void OnLoadingBehaviorObserved(
       const page_load_metrics::PageLoadExtraInfo& extra_info) {}
 
@@ skipping 16 matching lines @@
   // loads that result in downloads or 204s are aborted by the system, and are
   // also included as failed provisional loads.
   virtual void OnFailedProvisionalLoad(
       const FailedProvisionalLoadInfo& failed_provisional_load_info,
       const PageLoadExtraInfo& extra_info) {}
 };
 
 }  // namespace page_load_metrics
 
 #endif  // CHROME_BROWSER_PAGE_LOAD_METRICS_PAGE_LOAD_METRICS_OBSERVER_H_