[WIP] bindings: Introduce PropertyBag

Source/bindings/core/v8/custom/V8MessageEventCustom.cpp

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 96 matching lines @@
     MessageEvent* event = V8MessageEvent::toImpl(info.Holder());
     TOSTRING_VOID(V8StringResource<>, typeArg, info[0]);
     TONATIVE_VOID(bool, canBubbleArg, info[1]->BooleanValue());
     TONATIVE_VOID(bool, cancelableArg, info[2]->BooleanValue());
     v8::Handle<v8::Value> dataArg = info[3];
     TOSTRING_VOID(V8StringResource<>, originArg, info[4]);
     TOSTRING_VOID(V8StringResource<>, lastEventIdArg, info[5]);
     LocalDOMWindow* sourceArg = toDOMWindow(info[6], info.GetIsolate());
     OwnPtrWillBeRawPtr<MessagePortArray> portArray = nullptr;
     const int portArrayIndex = 7;
+
     if (!isUndefinedOrNull(info[portArrayIndex])) {
+        ExceptionState exceptionState(ExceptionState::ExecutionContext, "initMessageEvent", info.Holder(), info.GetIsolate());
         portArray = adoptPtrWillBeNoop(new MessagePortArray);
-        bool success = false;
-        *portArray = toRefPtrWillBeMemberNativeArray<MessagePort, V8MessagePort>(info[portArrayIndex], portArrayIndex + 1, info.GetIsolate(), &success);
-        if (!success)
+        *portArray = toRefPtrWillBeMemberNativeArray<MessagePort, V8MessagePort>(info[portArrayIndex], portArrayIndex + 1, info.GetIsolate(), &exceptionState);
+        if (exceptionState.throwIfNeeded())
             return;
     }
     event->initMessageEvent(typeArg, canBubbleArg, cancelableArg, originArg, lastEventIdArg, sourceArg, portArray.release());
 
     if (!dataArg.IsEmpty()) {
         V8HiddenValue::setHiddenValue(info.GetIsolate(), info.Holder(), V8HiddenValue::data(info.GetIsolate()), dataArg);
         if (DOMWrapperWorld::current(info.GetIsolate()).isIsolatedWorld())
             event->setSerializedData(SerializedScriptValue::createAndSwallowExceptions(dataArg, info.GetIsolate()));
     }
 }
 
 } // namespace blink