ServiceWorker: Update the install sequence as per the latest spec

content/common/service_worker/service_worker_messages.h

Index: content/common/service_worker/service_worker_messages.h
diff --git a/content/common/service_worker/service_worker_messages.h b/content/common/service_worker/service_worker_messages.h
index 1362f0952c58bab981f37ac96ede5b0e1463d898..42943e5ecf52f6c94fb66b362f9d6efeadaaeeb3 100644
--- a/content/common/service_worker/service_worker_messages.h
+++ b/content/common/service_worker/service_worker_messages.h
@@ -185,10 +185,11 @@ IPC_MESSAGE_ROUTED1(ServiceWorkerHostMsg_CacheStorageKeys,
 // on the correct thread.
 
 // Response to ServiceWorkerMsg_RegisterServiceWorker.
-IPC_MESSAGE_CONTROL3(ServiceWorkerMsg_ServiceWorkerRegistered,
+IPC_MESSAGE_CONTROL4(ServiceWorkerMsg_ServiceWorkerRegistered,
                      int /* thread_id */,
                      int /* request_id */,
-                     content::ServiceWorkerRegistrationObjectInfo)
+                     content::ServiceWorkerRegistrationObjectInfo,
+                     content::ServiceWorkerVersionAttributes)
 
 // Response to ServiceWorkerMsg_UnregisterServiceWorker.
 IPC_MESSAGE_CONTROL2(ServiceWorkerMsg_ServiceWorkerUnregistered,
@@ -217,6 +218,12 @@ IPC_MESSAGE_CONTROL5(ServiceWorkerMsg_SetVersionAttributes,
                      int /* changed_mask */,
                      content::ServiceWorkerVersionAttributes)
 
+// Informs the child process that new ServiceWorker enters the installation
+// phase.
+IPC_MESSAGE_CONTROL2(ServiceWorkerMsg_UpdateFound,
+                     int /* thread_id */,
+                     content::ServiceWorkerRegistrationObjectInfo)
+
 // Tells the child process to set the controller ServiceWorker for the given
 // provider.
 IPC_MESSAGE_CONTROL3(ServiceWorkerMsg_SetControllerServiceWorker,