Generalize the reload PLMO to support other transition types.

chrome/browser/page_load_metrics/observers/core_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_OBSERVERS_CORE_PAGE_LOAD_METRICS_OBSERVER_H_
 #define CHROME_BROWSER_PAGE_LOAD_METRICS_OBSERVERS_CORE_PAGE_LOAD_METRICS_OBSERVER_H_
 
 #include "components/page_load_metrics/browser/page_load_metrics_observer.h"
 
 namespace internal {
@@ skipping 14 matching lines @@
 extern const char kHistogramParseDuration[];
 extern const char kHistogramParseBlockedOnScriptLoad[];
 
 extern const char kBackgroundHistogramCommit[];
 extern const char kBackgroundHistogramFirstLayout[];
 extern const char kBackgroundHistogramFirstTextPaint[];
 extern const char kBackgroundHistogramDomContentLoaded[];
 extern const char kBackgroundHistogramLoad[];
 extern const char kBackgroundHistogramFirstPaint[];
 
+extern const char kHistogramLoadTypeFirstContentfulPaintReload[];
+extern const char kHistogramLoadTypeFirstContentfulPaintForwardBack[];
+extern const char kHistogramLoadTypeFirstContentfulPaintNewNavigation[];
+
 extern const char kHistogramBackgroundBeforePaint[];
 extern const char kHistogramFailedProvisionalLoad[];
 
 extern const char kRapporMetricsNameCoarseTiming[];
 
 }  // namespace internal
 
 // Observer responsible for recording 'core' page load metrics. Core metrics are
 // maintained by loading-dev team, typically the metrics under
 // PageLoad.(Document|Paint|Parse)Timing.*.
 class CorePageLoadMetricsObserver
     : public page_load_metrics::PageLoadMetricsObserver {
  public:
   CorePageLoadMetricsObserver();
   ~CorePageLoadMetricsObserver() override;
 
   // page_load_metrics::PageLoadMetricsObserver:
+  void OnCommit(content::NavigationHandle* navigation_handle) override;
   void OnDomContentLoadedEventStart(
       const page_load_metrics::PageLoadTiming& timing,
       const page_load_metrics::PageLoadExtraInfo& extra_info) override;
   void OnLoadEventStart(
       const page_load_metrics::PageLoadTiming& timing,
       const page_load_metrics::PageLoadExtraInfo& extra_info) override;
   void OnFirstLayout(
       const page_load_metrics::PageLoadTiming& timing,
       const page_load_metrics::PageLoadExtraInfo& extra_info) override;
   void OnFirstPaint(
@@ skipping 29 matching lines @@
     FailedProvisionalLoadInfo();
     ~FailedProvisionalLoadInfo();
   };
 
   void RecordTimingHistograms(const page_load_metrics::PageLoadTiming& timing,
                               const page_load_metrics::PageLoadExtraInfo& info);
   void RecordRappor(const page_load_metrics::PageLoadTiming& timing,
                     const page_load_metrics::PageLoadExtraInfo& info);
 
   FailedProvisionalLoadInfo failed_provisional_load_info_;
+  ui::PageTransition transition_;
+  bool initiated_by_user_gesture_;
 
   DISALLOW_COPY_AND_ASSIGN(CorePageLoadMetricsObserver);
 };
 
 #endif  // CHROME_BROWSER_PAGE_LOAD_METRICS_OBSERVERS_CORE_PAGE_LOAD_METRICS_OBSERVER_H_