More informative error messages for non-Transferables.

Source/bindings/v8/custom/V8WindowCustom.cpp

 /*
  * Copyright (C) 2009, 2011 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 244 matching lines @@
     //   postMessage(message, {sequence of transferrables}, targetOrigin);
     MessagePortArray portArray;
     ArrayBufferArray arrayBufferArray;
     int targetOriginArgIndex = 1;
     if (args.Length() > 2) {
         int transferablesArgIndex = 2;
         if (isLegacyTargetOriginDesignation(args[2])) {
             targetOriginArgIndex = 2;
             transferablesArgIndex = 1;
         }
-        if (!extractTransferables(args[transferablesArgIndex], portArray, arrayBufferArray, args.GetIsolate()))
+        String typeErrorMessage(transferablesArgIndex == 1 ? "Second argument is not a sequence type" : "Third argument is not a sequence type");

[Mike West, 2013/10/21 06:51:22]

Ditto.

+        if (!extractTransferables(args[transferablesArgIndex], portArray, arrayBufferArray, args.GetIsolate(), typeErrorMessage))
             return;
     }
     V8TRYCATCH_FOR_V8STRINGRESOURCE_VOID(V8StringResource<WithUndefinedOrNullCheck>, targetOrigin, args[targetOriginArgIndex]);
 
     bool didThrow = false;
     RefPtr<SerializedScriptValue> message =
         SerializedScriptValue::create(args[0], &portArray, &arrayBufferArray, didThrow, args.GetIsolate());
     if (didThrow)
         return;
 
@@ skipping 262 matching lines @@
     v8::Handle<v8::Context> context = frame->script()->currentWorldContext();
     if (context.IsEmpty())
         return v8Undefined();
 
     v8::Handle<v8::Object> global = context->Global();
     ASSERT(!global.IsEmpty());
     return global;
 }
 
 } // namespace WebCore