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

Source/bindings/core/v8/custom/V8InjectedScriptHostCustom.cpp

Index: Source/bindings/core/v8/custom/V8InjectedScriptHostCustom.cpp
diff --git a/Source/bindings/core/v8/custom/V8InjectedScriptHostCustom.cpp b/Source/bindings/core/v8/custom/V8InjectedScriptHostCustom.cpp
index c169b37bca1197a1324d0529837def04cd6c4c7a..1363128c7fe20c1ed137d47413fc9237a5c6b611 100644
--- a/Source/bindings/core/v8/custom/V8InjectedScriptHostCustom.cpp
+++ b/Source/bindings/core/v8/custom/V8InjectedScriptHostCustom.cpp
@@ -356,10 +356,15 @@ void V8InjectedScriptHost::inspectMethodCustom(const v8::FunctionCallbackInfo<v8
         return;
 
     InjectedScriptHost* host = V8InjectedScriptHost::toImpl(info.Holder());
-    ScriptState* scriptState = ScriptState::current(info.GetIsolate());
+    v8::Isolate* isolate = info.GetIsolate();
+    ScriptState* scriptState = ScriptState::current(isolate);
     ScriptValue object(scriptState, info[0]);
     ScriptValue hints(scriptState, info[1]);
-    host->inspectImpl(object.toJSONValue(scriptState), hints.toJSONValue(scriptState));
+    ScriptState::Scope scope(scriptState);
+    NonThrowableExceptionState exceptionState;
+    RefPtr<JSONValue> jsonObject = ScriptValue::to<JSONValuePtr>(isolate, object, exceptionState);
+    RefPtr<JSONValue> jsonHints = ScriptValue::to<JSONValuePtr>(isolate, hints, exceptionState);
+    host->inspectImpl(jsonObject, jsonHints);
 }
 
 void V8InjectedScriptHost::evalMethodCustom(const v8::FunctionCallbackInfo<v8::Value>& info)