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

third_party/WebKit/Source/core/timing/Performance.h

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  * Copyright (C) 2012 Intel Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 26 matching lines @@
 #include "core/frame/PerformanceMonitor.h"
 #include "core/timing/MemoryInfo.h"
 #include "core/timing/PerformanceBase.h"
 #include "core/timing/PerformanceNavigation.h"
 #include "core/timing/PerformanceTiming.h"
 
 namespace blink {
 
 class ScriptState;
 class ScriptValue;
+class ResourceTimingInfo;
 
 class CORE_EXPORT Performance final : public PerformanceBase,
                                       public ContextLifecycleObserver,
                                       public PerformanceMonitor::Client {
   DEFINE_WRAPPERTYPEINFO();
   USING_GARBAGE_COLLECTED_MIXIN(Performance);
   friend class PerformanceTest;
 
  public:
   static Performance* create(LocalFrame* frame) {
@@ skipping 12 matching lines @@
   ScriptValue toJSONForBinding(ScriptState*) const;
 
   DECLARE_VIRTUAL_TRACE();
 
  private:
   explicit Performance(LocalFrame*);
 
   // ContextLifecycleObserver overrides.
   void contextDestroyed(ExecutionContext*) override;
 
+  std::unique_ptr<ResourceTimingInfo> getNavigationTimingInfo() const;
+
+  PerformanceNavigationTiming* getNavigationTimingInstance() override;
+
   static std::pair<String, DOMWindow*> sanitizedAttribution(
       ExecutionContext*,
       bool hasMultipleContexts,
       LocalFrame* observerFrame);
 
   // PerformanceMonitor::Client implementation.
   void reportLongTask(double startTime,
                       double endTime,
                       ExecutionContext* taskContext,
                       bool hasMultipleContexts) override;
 
   mutable Member<PerformanceNavigation> m_navigation;
   mutable Member<PerformanceTiming> m_timing;
 };
 
 }  // namespace blink
 
 #endif  // Performance_h