Report nav timing 2 instance as soon as it's requested.

third_party/WebKit/Source/platform/loader/fetch/ResourceFetcher.h

 /*
     Copyright (C) 1998 Lars Knoll (knoll@mpi-hd.mpg.de)
     Copyright (C) 2001 Dirk Mueller <mueller@kde.org>
     Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All
     rights reserved.
     Copyright (C) 2009 Torch Mobile Inc. http://www.torchmobile.com/
 
     This library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Library General Public
     License as published by the Free Software Foundation; either
@@ skipping 124 matching lines @@
   static void determineRequestContext(ResourceRequest&,
                                       Resource::Type,
                                       bool isMainFrame);
   void determineRequestContext(ResourceRequest&, Resource::Type);
 
   void updateAllImageResourcePriorities();
 
   void reloadLoFiImages();
 
   // Calling this method before main document resource is fetched is invalid.
-  ResourceTimingInfo* getNavigationTimingInfo();
+  // This method should only be called once.
+  std::unique_ptr<ResourceTimingInfo> getNavigationTimingInfo();
 
   // This is only exposed for testing purposes.
   HeapListHashSet<Member<Resource>>* preloads() { return m_preloads.get(); }
 
   // Workaround for https://crbug.com/666214.
   // TODO(hiroshige): Remove this hack.
   void emulateLoadStartedForInspector(Resource*,
                                       const KURL&,
                                       WebURLRequest::RequestContext,
                                       const AtomicString& initiatorName);
@@ skipping 71 matching lines @@
   Member<HeapListHashSet<Member<Resource>>> m_preloads;
   Member<MHTMLArchive> m_archive;
 
   TaskRunnerTimer<ResourceFetcher> m_resourceTimingReportTimer;
 
   using ResourceTimingInfoMap =
       HeapHashMap<Member<Resource>, std::unique_ptr<ResourceTimingInfo>>;
   ResourceTimingInfoMap m_resourceTimingInfoMap;
 
   std::unique_ptr<ResourceTimingInfo> m_navigationTimingInfo;
+  ResourceTimingInfo* m_navigationTimingInfoRef;
 
   Vector<std::unique_ptr<ResourceTimingInfo>> m_scheduledResourceTimingReports;
 
   HeapHashSet<Member<ResourceLoader>> m_loaders;
   HeapHashSet<Member<ResourceLoader>> m_nonBlockingLoaders;
 
   // Used in hit rate histograms.
   class DeadResourceStatsRecorder {
     DISALLOW_NEW();
 
@@ skipping 37 matching lines @@
   }
 
  private:
   Member<ResourceFetcher> m_loader;
   bool m_previousState;
 };
 
 }  // namespace blink
 
 #endif  // ResourceFetcher_h