Add Prerender type to NavigationType for nav timing 2

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

Index: third_party/WebKit/Source/core/timing/PerformanceNavigationTiming.cpp
diff --git a/third_party/WebKit/Source/core/timing/PerformanceNavigationTiming.cpp b/third_party/WebKit/Source/core/timing/PerformanceNavigationTiming.cpp
index 080836e01b62a151347b338d2609ebba07393c95..511148688462007074fd4bb50d4126d08b9588da 100644
--- a/third_party/WebKit/Source/core/timing/PerformanceNavigationTiming.cpp
+++ b/third_party/WebKit/Source/core/timing/PerformanceNavigationTiming.cpp
@@ -31,7 +31,7 @@ PerformanceNavigationTiming::PerformanceNavigationTiming(
     double domContentLoadedEventStart,
     double domContentLoadedEventEnd,
     double domComplete,
-    NavigationType type,
+    PerformanceNavigationType type,
     double redirectStart,
     double redirectEnd,
     double fetchStart,
@@ -124,10 +124,12 @@ AtomicString PerformanceNavigationTiming::type() const {
   // TODO(sunjian) Right now NavigationType doesn't seem to have a Prerender
   // type yet, need to look into this crbug/663217
   switch (m_type) {
-    case NavigationTypeReload:
+    case KTypeReload:
       return "reload";
-    case NavigationTypeBackForward:
+    case KTypeBackForward:
       return "back_forward";
+    case KTypePrerender:
+      return "prerender";
     default:
       return "navigate";
   }