WebMessaging: Show a warning when MessagePort attempts to send a transferable ArrayBuffer

Source/core/dom/MessagePort.cpp

Index: Source/core/dom/MessagePort.cpp
diff --git a/Source/core/dom/MessagePort.cpp b/Source/core/dom/MessagePort.cpp
index d35c3cf0e86811a0ade6a9c69f26bf34af02cb2e..f7e86f732c2db043f682b7fc4a41909c4a07ba3f 100644
--- a/Source/core/dom/MessagePort.cpp
+++ b/Source/core/dom/MessagePort.cpp
@@ -36,6 +36,7 @@
 #include "core/dom/ExecutionContext.h"
 #include "core/events/MessageEvent.h"
 #include "core/frame/LocalDOMWindow.h"
+#include "core/inspector/ConsoleMessage.h"
 #include "core/workers/WorkerGlobalScope.h"
 #include "public/platform/WebString.h"
 #include "wtf/Functional.h"
@@ -87,6 +88,9 @@ void MessagePort::postMessage(ExecutionContext* context, PassRefPtr<SerializedSc
             return;
     }
 
+    if (message->containsTransferableArrayBuffer())
+        executionContext()->addConsoleMessage(ConsoleMessage::create(JSMessageSource, WarningMessageLevel, "MessagePort cannot send an ArrayBuffer as a transferable object yet. See http://crbug.com/334408"));
+
     WebString messageString = message->toWireString();
     OwnPtr<WebMessagePortChannelArray> webChannels = toWebMessagePortChannelArray(channels.release());
     m_entangledChannel->postMessage(messageString, webChannels.leakPtr());