ServiceWorker: Introduce SWMessageSender in order to mock IPC messaging

content/child/service_worker/web_service_worker_provider_impl.cc

Index: content/child/service_worker/web_service_worker_provider_impl.cc
diff --git a/content/child/service_worker/web_service_worker_provider_impl.cc b/content/child/service_worker/web_service_worker_provider_impl.cc
index f3a57f02efc99af2d046a30d88024ede26baeb57..d064dec34bd214211260c11471adb8c47861a703 100644
--- a/content/child/service_worker/web_service_worker_provider_impl.cc
+++ b/content/child/service_worker/web_service_worker_provider_impl.cc
@@ -8,6 +8,7 @@
 #include "base/logging.h"
 #include "content/child/service_worker/service_worker_dispatcher.h"
 #include "content/child/service_worker/service_worker_handle_reference.h"
+#include "content/child/service_worker/service_worker_message_sender.h"
 #include "content/child/service_worker/service_worker_provider_context.h"
 #include "content/child/service_worker/service_worker_registration_handle_reference.h"
 #include "content/child/service_worker/web_service_worker_impl.h"
@@ -24,7 +25,7 @@ namespace content {
 WebServiceWorkerProviderImpl::WebServiceWorkerProviderImpl(
     ThreadSafeSender* thread_safe_sender,
     ServiceWorkerProviderContext* context)
-    : thread_safe_sender_(thread_safe_sender),
+    : sender_(new ServiceWorkerMessageSender(thread_safe_sender)),
       context_(context),
       provider_id_(context->provider_id()) {
 }
@@ -98,7 +99,7 @@ void WebServiceWorkerProviderImpl::RemoveProviderClient() {
 
 ServiceWorkerDispatcher* WebServiceWorkerProviderImpl::GetDispatcher() {
   return ServiceWorkerDispatcher::GetOrCreateThreadSpecificInstance(
-      thread_safe_sender_.get());
+      sender_.get());
 }
 
 }  // namespace content