Structured cloning: improve DataCloneError reporting.

Source/bindings/v8/custom/V8DedicatedWorkerGlobalScopeCustom.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 26 matching lines @@
 #include "bindings/v8/V8Binding.h"
 #include "bindings/v8/V8Utilities.h"
 #include "bindings/v8/V8WorkerGlobalScopeEventListener.h"
 #include "core/workers/DedicatedWorkerGlobalScope.h"
 #include "wtf/ArrayBuffer.h"
 
 namespace WebCore {
 
 void V8DedicatedWorkerGlobalScope::postMessageMethodCustom(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
+    ExceptionState exceptionState(ExceptionState::ExecutionContext, "postMessage", "WorkerGlobalScope", info.Holder(), info.GetIsolate());
     DedicatedWorkerGlobalScope* workerGlobalScope = V8DedicatedWorkerGlobalScope::toNative(info.Holder());
     MessagePortArray ports;
     ArrayBufferArray arrayBuffers;
     if (info.Length() > 1) {
         const int transferablesArgIndex = 1;
-        bool notASequence = false;
-        if (!extractTransferables(info[transferablesArgIndex], ports, arrayBuffers, notASequence, info.GetIsolate())) {
-            if (notASequence)
-                throwTypeError(ExceptionMessages::failedToExecute("postMessage", "WorkerGlobalScope", ExceptionMessages::notAnArrayTypeArgumentOrValue(transferablesArgIndex + 1)), info.GetIsolate());
+        if (!extractTransferables(info[transferablesArgIndex], transferablesArgIndex, ports, arrayBuffers, exceptionState, info.GetIsolate())) {
+            exceptionState.throwIfNeeded();
             return;
         }
     }
-    bool didThrow = false;
-    RefPtr<SerializedScriptValue> message = SerializedScriptValue::create(info[0], &ports, &arrayBuffers, didThrow, info.GetIsolate());
-    if (didThrow)
+    RefPtr<SerializedScriptValue> message = SerializedScriptValue::create(info[0], &ports, &arrayBuffers, exceptionState, info.GetIsolate());
+    if (exceptionState.throwIfNeeded())
         return;
-    ExceptionState exceptionState(info.Holder(), info.GetIsolate());
+
     workerGlobalScope->postMessage(message.release(), &ports, exceptionState);
     exceptionState.throwIfNeeded();
 }
 
 } // namespace WebCore