Add serializers for window.performance.

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

Index: third_party/WebKit/Source/core/timing/PerformanceNavigation.cpp
diff --git a/third_party/WebKit/Source/core/timing/PerformanceNavigation.cpp b/third_party/WebKit/Source/core/timing/PerformanceNavigation.cpp
index 1c61ec4bc3d708e0cb38e03bd97bdac55f2da8a1..9084094b8a365053f3aa76e90c6a462e2c673a00 100644
--- a/third_party/WebKit/Source/core/timing/PerformanceNavigation.cpp
+++ b/third_party/WebKit/Source/core/timing/PerformanceNavigation.cpp
@@ -30,6 +30,8 @@
 
 #include "core/timing/PerformanceNavigation.h"
 
+#include "bindings/core/v8/ScriptValue.h"
+#include "bindings/core/v8/V8ObjectBuilder.h"
 #include "core/frame/LocalFrame.h"
 #include "core/loader/DocumentLoader.h"
 #include "core/loader/FrameLoaderTypes.h"
@@ -72,6 +74,14 @@ unsigned short PerformanceNavigation::redirectCount() const {
   return timing.redirectCount();
 }
 
+ScriptValue PerformanceNavigation::toJSONForBinding(
+    ScriptState* scriptState) const {
+  V8ObjectBuilder result(scriptState);
+  result.addNumber("type", type());
+  result.addNumber("redirectCount", redirectCount());
+  return result.scriptValue();
+}
+
 DEFINE_TRACE(PerformanceNavigation) {
   DOMWindowProperty::trace(visitor);
 }