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

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

Index: third_party/WebKit/Source/core/timing/Performance.h
diff --git a/third_party/WebKit/Source/core/timing/Performance.h b/third_party/WebKit/Source/core/timing/Performance.h
index 74254e99fc37fe6ee914c76c4e3fcd85f979f6c0..22706e9c1a1289c881f625b69af625d8c689538e 100644
--- a/third_party/WebKit/Source/core/timing/Performance.h
+++ b/third_party/WebKit/Source/core/timing/Performance.h
@@ -44,6 +44,7 @@ namespace blink {
 
 class ScriptState;
 class ScriptValue;
+class ResourceTimingInfo;
 
 class CORE_EXPORT Performance final : public PerformanceBase,
                                       public ContextLifecycleObserver,
@@ -76,6 +77,10 @@ class CORE_EXPORT Performance final : public PerformanceBase,
   // ContextLifecycleObserver overrides.
   void contextDestroyed(ExecutionContext*) override;
 
+  std::unique_ptr<ResourceTimingInfo> getNavigationTimingInfo() const;
+
+  PerformanceNavigationTiming* getNavigationTimingInstance() override;
+
   static std::pair<String, DOMWindow*> sanitizedAttribution(
       ExecutionContext*,
       bool hasMultipleContexts,