Support dispatching ServiceWorker FetchEvent and receiving response

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 0081d9788b511817add5ab25dce51be28d593be2..0b3af8b5a69d792bc230549d2f877285a4aab674 100644
--- a/content/common/service_worker/service_worker_messages.h
+++ b/content/common/service_worker/service_worker_messages.h
@@ -26,7 +26,10 @@ IPC_STRUCT_TRAITS_BEGIN(content::ServiceWorkerFetchRequest)
   IPC_STRUCT_TRAITS_MEMBER(headers)
 IPC_STRUCT_TRAITS_END()
 
-IPC_STRUCT_TRAITS_BEGIN(content::ServiceWorkerFetchResponse)
+IPC_ENUM_TRAITS_MAX_VALUE(content::ServiceWorkerFetchEventResult,
+                          content::SERVICE_WORKER_FETCH_EVENT_LAST)
+
+IPC_STRUCT_TRAITS_BEGIN(content::ServiceWorkerResponse)
   IPC_STRUCT_TRAITS_MEMBER(status_code)
   IPC_STRUCT_TRAITS_MEMBER(status_text)
   IPC_STRUCT_TRAITS_MEMBER(method)
@@ -90,6 +93,7 @@ IPC_MESSAGE_CONTROL1(ServiceWorkerHostMsg_ProviderDestroyed,
 // to the documents).
 IPC_MESSAGE_CONTROL0(ServiceWorkerHostMsg_InstallEventFinished)
 
-  // Informs the browser that fetch event handling has finished.
-IPC_MESSAGE_CONTROL1(ServiceWorkerHostMsg_FetchEventFinished,
-                     content::ServiceWorkerFetchResponse)
+// Informs the browser that fetch event handling has finished.
+IPC_MESSAGE_CONTROL2(ServiceWorkerHostMsg_FetchEventFinished,
+                     content::ServiceWorkerFetchEventResult,
+                     content::ServiceWorkerResponse)