[bindings] Let NativeValueTraits<T>::nativeValue be variadic function and merge various convers…

Source/bindings/core/v8/V8Binding.h

Index: Source/bindings/core/v8/V8Binding.h
diff --git a/Source/bindings/core/v8/V8Binding.h b/Source/bindings/core/v8/V8Binding.h
index 3c4729d5d60bb82f5918e67074219ab3ffae9cfd..80194a0badd58d41c9831d66851a81fea490f3b0 100644
--- a/Source/bindings/core/v8/V8Binding.h
+++ b/Source/bindings/core/v8/V8Binding.h
@@ -45,6 +45,7 @@
 #include "bindings/core/v8/V8ThrowException.h"
 #include "bindings/core/v8/V8ValueCache.h"
 #include "core/CoreExport.h"
+#include "platform/JSONValues.h"
 #include "platform/heap/Handle.h"
 #include "wtf/text/AtomicString.h"
 #include <v8.h>
@@ -841,6 +842,13 @@ struct NativeValueTraits<Vector<T>> {
     }
 };
 
+typedef PassRefPtr<JSONValue> JSONValuePtr;
+
+template <>
+struct NativeValueTraits<JSONValuePtr> {
+    static JSONValuePtr nativeValue(v8::Local<v8::Value>, v8::Isolate*, ExceptionState&, int maxDepth = JSONValue::maxDepth);
+};
+
 CORE_EXPORT v8::Isolate* toIsolate(ExecutionContext*);
 v8::Isolate* toIsolate(LocalFrame*);
 
@@ -902,8 +910,6 @@ void addHiddenValueToArray(v8::Isolate*, v8::Handle<v8::Object>, v8::Local<v8::V
 void removeHiddenValueFromArray(v8::Isolate*, v8::Handle<v8::Object>, v8::Local<v8::Value>, int cacheIndex);
 CORE_EXPORT void moveEventListenerToNewWrapper(v8::Isolate*, v8::Handle<v8::Object>, EventListener* oldValue, v8::Local<v8::Value> newValue, int cacheIndex);
 
-PassRefPtr<JSONValue> v8ToJSONValue(v8::Isolate*, v8::Handle<v8::Value>, int);
-
 // Result values for platform object 'deleter' methods,
 // http://www.w3.org/TR/WebIDL/#delete
 enum DeleteResult {