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

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

Index: third_party/WebKit/Source/core/timing/PerformanceResourceTiming.h
diff --git a/third_party/WebKit/Source/core/timing/PerformanceResourceTiming.h b/third_party/WebKit/Source/core/timing/PerformanceResourceTiming.h
index 222b1e2c748402a87d1cd63d6dbd4ceacee1f235..755afdde5a0162b26a8e16aad9db8de212b819e5 100644
--- a/third_party/WebKit/Source/core/timing/PerformanceResourceTiming.h
+++ b/third_party/WebKit/Source/core/timing/PerformanceResourceTiming.h
@@ -66,41 +66,31 @@ class CORE_EXPORT PerformanceResourceTiming : public PerformanceEntry {
                                          allowTimingDetails, false);
   }
 

[panicker, 2017/02/03 23:53:52]

Add link to design doc ...

[sunjian, 2017/02/10 18:32:46]

Done.

-  AtomicString initiatorType() const;
-
-  DOMHighResTimeStamp workerStart() const;
+  virtual AtomicString initiatorType() const;
+  virtual DOMHighResTimeStamp workerStart() const;
   virtual DOMHighResTimeStamp redirectStart() const;
   virtual DOMHighResTimeStamp redirectEnd() const;
   virtual DOMHighResTimeStamp fetchStart() const;
-  DOMHighResTimeStamp domainLookupStart() const;
-  DOMHighResTimeStamp domainLookupEnd() const;
-  DOMHighResTimeStamp connectStart() const;
-  DOMHighResTimeStamp connectEnd() const;
-  DOMHighResTimeStamp secureConnectionStart() const;
-  DOMHighResTimeStamp requestStart() const;
-  DOMHighResTimeStamp responseStart() const;
+  virtual DOMHighResTimeStamp domainLookupStart() const;
+  virtual DOMHighResTimeStamp domainLookupEnd() const;
+  virtual DOMHighResTimeStamp connectStart() const;
+  virtual DOMHighResTimeStamp connectEnd() const;
+  virtual DOMHighResTimeStamp secureConnectionStart() const;
+  virtual DOMHighResTimeStamp requestStart() const;
+  virtual DOMHighResTimeStamp responseStart() const;
   virtual DOMHighResTimeStamp responseEnd() const;
-  unsigned long long transferSize() const;
-  unsigned long long encodedBodySize() const;
-  unsigned long long decodedBodySize() const;
+  virtual unsigned long long transferSize() const;
+  virtual unsigned long long encodedBodySize() const;
+  virtual unsigned long long decodedBodySize() const;
 
  protected:
   void buildJSONValue(V8ObjectBuilder&) const override;
 
-  PerformanceResourceTiming(const AtomicString& initiatorType,
-                            double timeOrigin,
-                            ResourceLoadTiming*,
-                            double lastRedirectEndTime,
-                            double finishTime,
-                            unsigned long long transferSize,
-                            unsigned long long encodedBodyLength,
-                            unsigned long long decodedBodyLength,
-                            bool didReuseConnection,
-                            bool allowTimingDetails,
-                            bool allowRedirectDetails,
-                            const String& name,
+  // This constructor is for PerformanceNavigationTiming.
+  PerformanceResourceTiming(const String& name,
                             const String& entryType,
-                            double startTime);
+                            double startTime,
+                            double duration);
 
  private:
   PerformanceResourceTiming(const ResourceTimingInfo&,