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

Source/bindings/v8/custom/V8ClientCustom.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 "V8ServiceWorker.h"
+#include "V8Client.h"
 
 #include "bindings/v8/ExceptionMessages.h"
 #include "bindings/v8/ExceptionState.h"
 #include "bindings/v8/SerializedScriptValue.h"
 #include "bindings/v8/V8Binding.h"
 #include "core/dom/MessagePort.h"
 #include "modules/serviceworkers/ServiceWorker.h"
 #include "wtf/ArrayBuffer.h"
 
 namespace WebCore {
 
-void V8ServiceWorker::postMessageMethodCustom(const v8::FunctionCallbackInfo<v8::Value>& info)
+void V8Client::postMessageMethodCustom(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "postMessage", "ServiceWorker", info.Holder(), info.GetIsolate());
-    ServiceWorker* worker = V8ServiceWorker::toNative(info.Holder());
+    Client* client = V8Client::toNative(info.Holder());
     MessagePortArray ports;
     ArrayBufferArray arrayBuffers;
     if (info.Length() > 1) {
         const int transferablesArgIndex = 1;
         if (!SerializedScriptValue::extractTransferables(info[transferablesArgIndex], transferablesArgIndex, ports, arrayBuffers, exceptionState, info.GetIsolate())) {
             exceptionState.throwIfNeeded();
             return;
         }
     }
     RefPtr<SerializedScriptValue> message = SerializedScriptValue::create(info[0], &ports, &arrayBuffers, exceptionState, info.GetIsolate());
     if (exceptionState.throwIfNeeded())
         return;
-    worker->postMessage(message.release(), &ports, exceptionState);
+    ExecutionContext* context = currentExecutionContext(info.GetIsolate());
+    client->postMessage(context, message.release(), &ports, exceptionState);
     exceptionState.throwIfNeeded();
 }
 
 } // namespace WebCore