Add blink-side binding code and tests for ServiceWorker -> Document postMessage (3/3)

Source/modules/serviceworkers/Client.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "modules/serviceworkers/Client.h"
 
+#include "bindings/v8/ExceptionState.h"
+#include "modules/serviceworkers/ServiceWorkerGlobalScopeClient.h"
 #include "wtf/RefPtr.h"
 
 namespace WebCore {
 
 PassRefPtr<Client> Client::create(unsigned id)
 {
     return adoptRef(new Client(id));
 }
 
 Client::Client(unsigned id)
     : m_id(id)
 {
     ScriptWrappable::init(this);
 }
 
 Client::~Client()
 {
 }
 
+void Client::postMessage(ExecutionContext* context, PassRefPtr<SerializedScriptValue> message, const MessagePortArray* ports, ExceptionState& exceptionState)
+{
+    // Disentangle the port in preparation for sending it to the remote context.
+    OwnPtr<MessagePortChannelArray> channels = MessagePort::disentanglePorts(ports, exceptionState);
+    if (exceptionState.hadException())
+        return;
+
+    ServiceWorkerGlobalScopeClient::from(context)->postMessageToClient(m_id, message, channels.release());
+}
+
 } // namespace WebCore