ServiceWorker: Introduce SWMessageSender in order to mock IPC messaging

content/child/service_worker/service_worker_dispatcher.h

Index: content/child/service_worker/service_worker_dispatcher.h
diff --git a/content/child/service_worker/service_worker_dispatcher.h b/content/child/service_worker/service_worker_dispatcher.h
index 775c16b3d1d0d8bf87abdca3750cb30d6ec048e0..fe3902846c077247dfc8aed696f78d6164676ad0 100644
--- a/content/child/service_worker/service_worker_dispatcher.h
+++ b/content/child/service_worker/service_worker_dispatcher.h
@@ -28,7 +28,7 @@ class Message;
 
 namespace content {
 
-class ServiceWorkerMessageFilter;
+class ServiceWorkerMessageSender;
 class ServiceWorkerProviderContext;
 class ThreadSafeSender;
 class WebServiceWorkerImpl;
@@ -41,7 +41,8 @@ struct TransferredMessagePort;
 // This class manages communication with the browser process about
 // registration of the service worker, exposed to renderer and worker
 // scripts through methods like navigator.registerServiceWorker().
-class ServiceWorkerDispatcher : public WorkerTaskRunner::Observer {
+class CONTENT_EXPORT ServiceWorkerDispatcher
+    : public WorkerTaskRunner::Observer {
  public:
   typedef blink::WebServiceWorkerProvider::WebServiceWorkerRegistrationCallbacks
       WebServiceWorkerRegistrationCallbacks;
@@ -56,10 +57,10 @@ class ServiceWorkerDispatcher : public WorkerTaskRunner::Observer {
           WebServiceWorkerGetRegistrationForReadyCallbacks;
 
   explicit ServiceWorkerDispatcher(ThreadSafeSender* thread_safe_sender);
+  explicit ServiceWorkerDispatcher(ServiceWorkerMessageSender* sender);
   ~ServiceWorkerDispatcher() override;
 
   void OnMessageReceived(const IPC::Message& msg);
-  bool Send(IPC::Message* msg);
 
   // Corresponds to navigator.serviceWorker.register()
   void RegisterServiceWorker(
@@ -155,6 +156,7 @@ class ServiceWorkerDispatcher : public WorkerTaskRunner::Observer {
   typedef std::map<int, WebServiceWorkerRegistrationImpl*>
       RegistrationObjectMap;
 
+  friend class ServiceWorkerDispatcherTest;
   friend class WebServiceWorkerImpl;
   friend class WebServiceWorkerRegistrationImpl;
 
@@ -252,7 +254,7 @@ class ServiceWorkerDispatcher : public WorkerTaskRunner::Observer {
   // (e.g. as .current).
   WorkerToProviderMap worker_to_provider_;
 
-  scoped_refptr<ThreadSafeSender> thread_safe_sender_;
+  scoped_refptr<ServiceWorkerMessageSender> sender_;
 
   DISALLOW_COPY_AND_ASSIGN(ServiceWorkerDispatcher);
 };