Add Prerender type to NavigationType for nav timing 2

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

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef PerformanceNavigationTiming_h
 #define PerformanceNavigationTiming_h
 
 #include "core/CoreExport.h"
-#include "core/loader/FrameLoaderTypes.h"
 #include "core/timing/PerformanceResourceTiming.h"
 
 namespace blink {
 
 class CORE_EXPORT PerformanceNavigationTiming final
     : public PerformanceResourceTiming {
   DEFINE_WRAPPERTYPEINFO();
 
  public:
+  enum class NavigationType { Navigate, Reload, BackForward, Prerender };
+
   PerformanceNavigationTiming(double timeOrigin,
                               double unloadEventStart,
                               double unloadEventEnd,
                               double loadEventStart,
                               double loadEventEnd,
                               unsigned short redirectCount,
                               double domInteractive,
                               double domContentLoadedEventStart,
                               double domContentLoadedEventEnd,
                               double domComplete,
@@ skipping 49 matching lines @@
   double m_redirectStart;
   double m_redirectEnd;
   double m_fetchStart;
   double m_responseEnd;
   bool m_hasCrossOriginRedirect;
   bool m_hasSameOriginAsPreviousDocument;
 };
 }  // namespace blink
 
 #endif  // PerformanceNavigationTiming_h