Use UUID for ServiceWorker Client identifier (1/3, blink)

Source/modules/serviceworkers/ServiceWorkerClient.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/ServiceWorkerClient.h"
 
 #include "bindings/core/v8/CallbackPromiseAdapter.h"
 #include "bindings/core/v8/ExceptionState.h"
 #include "bindings/core/v8/SerializedScriptValue.h"
 #include "modules/serviceworkers/ServiceWorkerGlobalScopeClient.h"
 #include "public/platform/WebString.h"
 #include "wtf/RefPtr.h"
 
 namespace blink {
 
 ServiceWorkerClient* ServiceWorkerClient::create(const WebServiceWorkerClientInfo& info)
 {
     return new ServiceWorkerClient(info);
 }
 
 ServiceWorkerClient::ServiceWorkerClient(const WebServiceWorkerClientInfo& info)
     : m_id(info.clientID)
+    , m_uuid(info.uuid)
     , m_url(info.url.string())
 {
 }
 
 ServiceWorkerClient::~ServiceWorkerClient()
 {
 }
 
 void ServiceWorkerClient::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;
 
     WebString messageString = message->toWireString();
     OwnPtr<WebMessagePortChannelArray> webChannels = MessagePort::toWebMessagePortChannelArray(channels.release());
-    ServiceWorkerGlobalScopeClient::from(context)->postMessageToClient(m_id, messageString, webChannels.release());
+    if (!m_uuid.isEmpty()) {
+        ServiceWorkerGlobalScopeClient::from(context)->postMessageToClient(m_uuid, messageString, webChannels.release());
+    } else {
+        // FIXME: Deprecate this when we switch to uuid.
+        ServiceWorkerGlobalScopeClient::from(context)->postMessageToClient(m_id, messageString, webChannels.release());
+    }
 }
 
 } // namespace blink