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

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

Index: third_party/WebKit/Source/core/timing/Performance.cpp
diff --git a/third_party/WebKit/Source/core/timing/Performance.cpp b/third_party/WebKit/Source/core/timing/Performance.cpp
index 20e24d20693b5bd6a4eb7f10a0cc1b28e6d5309b..23b577c182ff170968620503a475f0feeb28a037 100644
--- a/third_party/WebKit/Source/core/timing/Performance.cpp
+++ b/third_party/WebKit/Source/core/timing/Performance.cpp
@@ -43,6 +43,8 @@
 #include "core/loader/DocumentLoader.h"
 #include "core/origin_trials/OriginTrials.h"
 #include "core/timing/PerformanceTiming.h"
+#include "platform/loader/fetch/ResourceTimingInfo.h"
+#include "platform/RuntimeEnabledFeatures.h"
 
 static const double kLongTaskThreshold = 0.05;
 
@@ -140,6 +142,19 @@ PerformanceTiming* Performance::timing() const {
   return m_timing.get();
 }
 
+PerformanceNavigationTiming* Performance::createNavigationTimingInstance() {
+  if (!RuntimeEnabledFeatures::performanceNavigationTiming2Enabled())
+    return nullptr;
+  if (!frame())
+    return nullptr;
+  const DocumentLoader* documentLoader = frame()->loader().documentLoader();
+  DCHECK(documentLoader);
+  ResourceTimingInfo* info = documentLoader->getNavigationTimingInfo();
+  if (!info)
+    return nullptr;
+  return new PerformanceNavigationTiming(frame(), info, timeOrigin());
+}
+
 void Performance::updateLongTaskInstrumentation() {
   DCHECK(frame());
   if (!frame()->document())