More informative error messages for non-Transferables.

Source/bindings/v8/V8Utilities.h

Index: Source/bindings/v8/V8Utilities.h
diff --git a/Source/bindings/v8/V8Utilities.h b/Source/bindings/v8/V8Utilities.h
index f1e664d5b4d25fe1961b0079326e77b0d9c4d322..1308f9faa7c1b5e3a0501a0e34dad591bf20d087 100644
--- a/Source/bindings/v8/V8Utilities.h
+++ b/Source/bindings/v8/V8Utilities.h
@@ -60,7 +60,7 @@ namespace WebCore {
     // Also validates the elements per sections 4.1.13 and 4.1.15 of the WebIDL spec and section 8.3.3
     // of the HTML5 spec and generates exceptions as appropriate.
     // Returns true if the array was filled, or false if the passed value was not of an appropriate type.
-    bool extractTransferables(v8::Local<v8::Value>, MessagePortArray&, ArrayBufferArray&, v8::Isolate*);
+    bool extractTransferables(v8::Local<v8::Value>, MessagePortArray&, ArrayBufferArray&, v8::Isolate*, const String& typeErrorMessage);
     bool getMessagePortArray(v8::Local<v8::Value>, MessagePortArray&, v8::Isolate*);
 
 } // namespace WebCore