Add Prerender type to NavigationType for nav timing 2

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

Index: third_party/WebKit/Source/core/timing/PerformanceBase.h
diff --git a/third_party/WebKit/Source/core/timing/PerformanceBase.h b/third_party/WebKit/Source/core/timing/PerformanceBase.h
index 3bbee2edb770f543264ff4152219cc1c445af1ae..739d5a5968a15f8b05b64e70a461067ec165c4fb 100644
--- a/third_party/WebKit/Source/core/timing/PerformanceBase.h
+++ b/third_party/WebKit/Source/core/timing/PerformanceBase.h
@@ -35,7 +35,9 @@
 #include "core/CoreExport.h"
 #include "core/dom/DOMHighResTimeStamp.h"
 #include "core/events/EventTarget.h"
+#include "core/loader/FrameLoaderTypes.h"
 #include "core/timing/PerformanceEntry.h"
+#include "core/timing/PerformanceNavigationTiming.h"
 #include "platform/Timer.h"
 #include "platform/heap/Handle.h"
 #include "wtf/Forward.h"
@@ -57,6 +59,8 @@ using PerformanceEntryVector = HeapVector<Member<PerformanceEntry>>;
 using PerformanceObservers = HeapListHashSet<Member<PerformanceObserver>>;
 
 class CORE_EXPORT PerformanceBase : public EventTargetWithInlineData {
+  friend class PerformanceBaseTest;
+
  public:
   ~PerformanceBase() override;
 
@@ -124,6 +128,11 @@ class CORE_EXPORT PerformanceBase : public EventTargetWithInlineData {
 
   DECLARE_VIRTUAL_TRACE();
 
+ private:
+  static PerformanceNavigationTiming::NavigationType getNavigationType(
+      NavigationType,
+      const Document*);
+
  protected:
   explicit PerformanceBase(double timeOrigin);