ServiceWorker: Add initial implementation of ExtendableMessageEvent behind a flag

content/renderer/service_worker/service_worker_context_client.cc

Index: content/renderer/service_worker/service_worker_context_client.cc
diff --git a/content/renderer/service_worker/service_worker_context_client.cc b/content/renderer/service_worker/service_worker_context_client.cc
index 49a4638bdcf91013cad76af2dba61c4c69b20bcf..ab4e41723045d937ce82964044d470f28ff92ae3 100644
--- a/content/renderer/service_worker/service_worker_context_client.cc
+++ b/content/renderer/service_worker/service_worker_context_client.cc
@@ -252,6 +252,8 @@ void ServiceWorkerContextClient::OnMessageReceived(
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(ServiceWorkerContextClient, message)
     IPC_MESSAGE_HANDLER(ServiceWorkerMsg_ActivateEvent, OnActivateEvent)
+    IPC_MESSAGE_HANDLER(ServiceWorkerMsg_ExtendableMessageEvent,
+                        OnExtendableMessageEvent)
     IPC_MESSAGE_HANDLER(ServiceWorkerMsg_FetchEvent, OnFetchEvent)
     IPC_MESSAGE_HANDLER(ServiceWorkerMsg_InstallEvent, OnInstallEvent)
     IPC_MESSAGE_HANDLER(ServiceWorkerMsg_NotificationClickEvent,
@@ -488,6 +490,13 @@ void ServiceWorkerContextClient::didHandleActivateEvent(
       GetRoutingID(), request_id, result));
 }
 
+void ServiceWorkerContextClient::didHandleExtendableMessageEvent(
+    int request_id,
+    blink::WebServiceWorkerEventResult result) {
+  Send(new ServiceWorkerHostMsg_ExtendableMessageEventFinished(
+      GetRoutingID(), request_id, result));
+}
+
 void ServiceWorkerContextClient::didHandleInstallEvent(
     int request_id,
     blink::WebServiceWorkerEventResult result) {
@@ -706,6 +715,19 @@ void ServiceWorkerContextClient::OnActivateEvent(int request_id) {
   proxy_->dispatchActivateEvent(request_id);
 }
 
+void ServiceWorkerContextClient::OnExtendableMessageEvent(
+    int request_id,
+    const base::string16& message,
+    const std::vector<TransferredMessagePort>& sent_message_ports,
+    const std::vector<int>& new_routing_ids) {
+  TRACE_EVENT0("ServiceWorker",
+               "ServiceWorkerContextClient::OnExtendableMessageEvent");
+  blink::WebMessagePortChannelArray ports =
+      WebMessagePortChannelImpl::CreatePorts(
+          sent_message_ports, new_routing_ids, main_thread_task_runner_);
+  proxy_->dispatchExtendableMessageEvent(request_id, message, ports);
+}
+
 void ServiceWorkerContextClient::OnInstallEvent(int request_id) {
   TRACE_EVENT0("ServiceWorker",
                "ServiceWorkerContextClient::OnInstallEvent");