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

Source/bindings/core/v8/SerializedScriptValue.cpp

Index: Source/bindings/core/v8/SerializedScriptValue.cpp
diff --git a/Source/bindings/core/v8/SerializedScriptValue.cpp b/Source/bindings/core/v8/SerializedScriptValue.cpp
index d5cc1368b1d0a47a6d94f6b9b0f5076f008a8233..bc1e32f4a090fdb4f9d5092eab00f52cbc79609f 100644
--- a/Source/bindings/core/v8/SerializedScriptValue.cpp
+++ b/Source/bindings/core/v8/SerializedScriptValue.cpp
@@ -238,6 +238,11 @@ void SerializedScriptValue::registerMemoryAllocatedWithCurrentScriptContext()
     v8::Isolate::GetCurrent()->AdjustAmountOfExternalAllocatedMemory(m_externallyAllocatedMemory);
 }
 
+bool SerializedScriptValue::containsTransferableArrayBuffer() const
+{
+    return m_arrayBufferContentsArray && !m_arrayBufferContentsArray->isEmpty();
+}
+
 SerializedScriptValue::~SerializedScriptValue()
 {
     // If the allocated memory was not registered before, then this class is likely